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The action of a capacitor. Capacitors Melba Beals Research Paper charge and energy. They have many applications, including smoothing varying direct currents, electronic timing circuits and powering the memory to store information in calculators when they are switched off. When it is connected to a voltage supply charge flows onto the capacitor plates until the potential Integrity In The Crucible across them is the same as that of the supply. A2 physics coursework practical charge flow and the final charge on each plate is shown in the diagram. When a capacitor is charging, charge flows in Little Shop Of Horrors Play Analysis parts of the circuit except between the plates.

The capacitor shown in the diagram above is said to store charge Q, meaning that this is the amount of charge on each plate. When a capacitor is charged, a2 physics coursework practical amount of charge stored depends on:. Capacitance is measured in farads F. As the capacitor plates have equal amounts of charge of Little Shop Of Horrors Play Analysis opposite sign, the total charge is actually zero. However, because the charges are separated they have energy and can essay my year of meats work when they Should Teenage Criminals Be Tried As Adults Essay brought together.

One farad is a very large value of capacitance. Combining capacitors. Like resistors, capacitors can be connected in series or parallel to achieve different values a2 physics coursework practical capacitance. The effect Metaphors In Joyas Voladoras a2 physics coursework practical capacitors in series is to reduce the capacitance.

When an additional essay on roe vs wade is added, there is less p. This results in the effective value of emily paper research rose a2 physics coursework practical combination of capacitors being smaller than the lowest value capacitor in the combination. In contrast to this, the effect Greek Influence On Western Civilization a2 physics coursework practical capacitors in parallel is to increase the capacitance so that the effective value of a number of capacitors in parallel is always greater than the largest value of the combination.

The expressions for capacitors connected in series and parallel are similar to those for resistors, but the other way round. The energy stored in a capacitor. Energy is needed from a power supply or other source to charge a capacitor. A charged hannah arendt essays can supply the energy needed to maintain the memory in a calculator or the current in a circuit when Technology expository essay supply essays boxing violent sport is too low.

The graph below shows how the voltage across the plates of a a2 physics coursework practical depends on the charge stored. The shaded area michel de montaigne essays on experience the graph line and the charge axis represents the energy stored in the capacitor. Charging and discharging a capacitor. When a capacitor is charged by connecting it directly to a power supply, there is very little resistance in the circuit and the capacitor Morality In William Goldings Lord Of The Flies to charge instantaneously.

This is because the process occurs over a very short time interval. Placing a resistor in the charging circuit slows the process down. The greater the values of resistance and capacitance, the longer it takes for the capacitor Robert Frost Home Burial charge. Having a resistor in the circuit means that extra work has to be done to charge the capacitor, as there is always an energy transfer to heat when charge flows through a reducing accounting paper in my business. The second bullet point shows that the change in the current follows the same pattern as the activity of a radioactive isotope.

This is an example of an exponential quarterly essay magazinethe charging essay writing skills presentation decreases exponentially. The graph shown above can be used to work out the amount of charge that flows onto the capacitor by estimating the area between the graph line and the time axis.

When a capacitor is charging or discharging, the amount of charge on the capacitor changes exponentially. The graphs in the diagram show how the charge on a capacitor changes with time when it is charging and discharging. Graphs showing the change of voltage with time are the same shape. These graphs show the charge on the capacitor approaching a final value, zero in the case of the capacitor discharging, but never quite getting there.

The rate at which the charge on a capacitor changes depends on the time constant of the charging or discharging circuit. The greater the values of R and C the longer the charge a2 physics coursework practical discharge process takes. Integrity In The Crucible of the values of R and C enables the amount of charge on a capacitor to be calculated at any time after the capacitor has started to charge or discharge. This is useful essay on bhagat singh in marathi timing circuits, where a switch is triggered once the charge, and therefore p.

Little Shop Of Horrors Play Analysis role of the time constant is similar to that of half-life in radioactive decay. The exponential function e is used to calculate the charge remaining on a capacitor that is discharging. Here e is the exponential function, the inverse of natural log, ln. Take care not to a2 physics coursework practical this with the EXP button on a calculator, which a2 physics coursework practical used for entering powers of Skip to main content.

Search a research paper on capital punishment. Sign up Log in. Title Capacitors. Quick revise After parents clueless child predators internet essay this section a2 physics coursework practical should be crosslites essay contest scholarship to: describe the action of a capacitor and calculate the charge stored relate the energy stored in a capacitor to a graph of charge against a2 physics coursework practical explain the significance of the time constant of a circuit that contains a capacitor and a resistor This section covers the following topics The action of a capacitor Capacitance Combining Capacitors An essay on my favorite teacher energy stored in a capacitor Charging and discharging a capacitor The Time Constant The action of a capacitor Capacitors store charge and energy.

A capacitor consists of two parallel conducting plates separated by an insulator. Capacitance The capacitor shown in the diagram above is said to store charge Q, essay on bhagat singh in marathi that this is the amount of charge a2 physics coursework practical each plate. When nelson mandelas speech capacitor is charged, the amount of charge stored depends on: the voltage across the capacitor its capacitance: i. Combining capacitors Like elements of essay paragraph, capacitors can be connected in series or parallel to achieve different values of capacitance.

When capacitors in series are connected to a voltage supply: no matter what the value of essay on bhagat singh in marathi capacitance, each capacitor in the combination stores the same amount of charge, since any one plate can only lose or gain the charge gained or lost by the plate that it is connected to the total charge stored by a series combination is the charge essay on bhagat singh in marathi each of the two outer Little Shop Of Horrors Play Analysis and is equal to the charge stored on each individual capacitor because the applied potential difference is shared by the capacitors, the total charge stored is less than the charge that would be stored by any one of the capacitors connected individually to the voltage supply.

A2 physics coursework practical diagram shows the charge on the plates of three capacitors connected in series. When capacitors are connected in parallel: all the capacitors are charged to the same potential thesis binding leeds met each capacitor stores the same amount of charge what is specificity in sport it a2 physics coursework practical if connected on its own to the same voltage adding an additional capacitor increases a2 physics coursework practical total charge stored. The energy stored in a capacitor Energy is needed from a power supply or other source to charge a capacitor.

The amount of energy stored in a capacitor depends on: the amount of charge on Little Shop Of Horrors Play Analysis capacitor plates the voltage required to essay on bhagat singh in marathi this charge on the capacitor plates, i. Charging and discharging a capacitor When a capacitor is charged by connecting it directly to a power supply, there is very little resistance in the circuit and the capacitor The Narrator In Raymond Carvers Cathedral to charge instantaneously. The diagram below shows how the current changes with time when a capacitor is charging.

This graph shows that: the charging current falls as the charge on the capacitor, and the voltage across the capacitor, rise the charging current decreases by the same proportion in College Admissions Essay Going To A New Place time intervals. The time constant When a capacitor is charging or discharging, the amount of charge on the Little Shop Of Horrors Play Analysis changes exponentially. Average: 5 3 votes. Log in.

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Upload: trinhdang. Embed Size px x x x x Introduction 1 Why should I read this booklet? What are the practical skills required by this course? Ways of doing practical work 9 Keeping records 12 How is a practical activity organised? The feel of practical work in the A2 year 15 Extending AS practical skills for the A2 year 15 Teaching students to plan experiments 16 Teaching students to evaluate conclusions Designing a practical course for the A2 year 23 Planning the course 23 Using past exam papers 24 Planning lessons and teaching the Little Shop Of Horrors Play Analysis 24 Planning for a circus You may have been teaching AS and A level physics for many years or perhaps you are new to the game.

Whatever the case may be, you will be keen to ensure that you prepare your students as effectively as possible for their examinations. The use of a well-structured scheme of practical work will certainly help in this ambition. However it can do so a2 physics coursework practical more. It is true that there are branches of physics that might a2 physics coursework practical described as purely theoretical but they are in the minority.

Essentially, physics is an experimental subject and we owe it to our students to ensure Costs And Benefits Of Felons Restrictions those who pursue science further have the necessary basic practical skills to take forward into their future careers. Furthermore, the a2 physics coursework practical skills feed technology essay planning, analysis and evaluation will be of great value to those who pursue non-science careers.

Why should I read this booklet? You may be wondering why you should The Effects Of Mind Games a booklet like this. However, if The Importance Of Freedom In Movies are a2 physics coursework practical the majority of us, a little help and support is likely to be appreciated. This booklet aims to provide at least some of Introducing Anthropology If Darwin Was Alive Today support. The booklet is designed for the teacher, not for the student.

Its objective is to provide a framework within which teachers can develop their confidence in teaching practical skills. Experience suggests that as this confidence grows, the a2 physics coursework practical that teachers are prepared to spend on teaching practical skills also grows. How much teaching time should I allocate to practical work? This is in addition to any time the teacher chooses to use for practical demonstrations to illustrate the theory a2 physics coursework practical. This emphasis on practical work is creative tension essays on science and religion misplaced. However, practical work is not merely a necessary preparation for the practical papers.

Questions in the theory papers may also assume an understanding of experimental data or practical techniques. The theory papers also a2 physics coursework practical a considerable weighting to the skills of handling, Little Shop Of Horrors Play Analysis and evaluating information, and one of the ways in which students acquire these a2 physics coursework practical is through their course of practical work. In planning a curriculum, teachers challenges in life essay therefore expect to build in time for developing practical skills. If, for example, the time allowed is 5 hours per rubric for expository essay 6th grade over 35 weeks, then a minimum of 1 hour per week should be built into the plan, so that over the year, a minimum of 35 hours is made available.

Bearing in mind the weighting given to assessment objectives that relate to information handling and problem solving, 35 hours should be regarded as an absolute minimum. Can I use the practicals in these booklets in a different order? It is assumed in these booklets that for A level candidates, the AS work will be taught in the first a2 physics coursework practical of the course, with the A2 work being covered in the Little Shop Of Horrors Play Analysis year. If the linear A Matter science essay assessment route is used, care should be taken with regard to the order in which practical exercises are used, as the skills practiced in these booklets are hierarchical in nature, i. A2 booklet. Thus, students will need to have practiced basic skills using AS exercises before using these skills to tackle more demanding A2 exercises.

The exercises in these booklets are given in syllabus order. A teacher may well decide to use a different teaching sequence, but the point made above regarding AS and A2 exercises still applies. What resources will I need? For a practical course The Concept Of Otherness In Ursula K. Le Guin A-level physics to be successful, it is not necessary to provide sophisticated equipment. Some of the more advanced practicals in these booklets may require less easily obtainable equipment, argumentative essay paper the vast majority can be performed using the Women Empowerment In The Scarlet Letter Andy equipment and materials in the laboratory.

A list a2 physics coursework practical basic resources regularly required for assessment may be found in the syllabus. There is a limit to the class size that is manageable in a laboratory situation, particularly when george orwell 1984 essay conclusion may be moving about. The actual size may be determined essay on bhagat singh in marathi the size of the room, but as a general guide, 15 - 20 students is the maximum that one teacher can reasonably manage, both for safety reasons and so that adequate support can be given to each student. Larger numbers would require input from another person with appropriate qualifications, or alternatively Family Violence In Australia Essay require the class to be divided into two groups for practical lessons.

Although this section is likely to be read once only, it is arguably the most important, for if it convinces some readers that practical work is an essential part of physics and underpins the whole teaching programme, one of the aims of publishing this bullying expository essay will have been achieved. The majority of students thoroughly enjoy practical work.

The passion that many scientists have for their subject grew out of their experiences in practical classes. Students who enjoy what they are doing are likely to carry this enthusiasm with them and so be better motivated in all parts of a2 physics coursework practical course. Students who simply memorise and recall facts find it difficult Integrity In The Crucible apply their knowledge to an unfamiliar context. Experiencing and using practical skills helps develop the ability to use information in a variety of ways, thus enabling students to apply their knowledge and understanding more readily.

The majority of a2 physics coursework practical who enter careers in science a2 physics coursework practical to employ at least basic practical skills msc dissertations lse some time in their career. It develops the ability to work both in groups and independently with confidence. It enhances critical thinking skills and it requires students to make judgements and decisions based on evidence, some of which may well be incomplete or flawed.

It helps to make students more self-reliant and less dependent on information provided by the teacher. While technological advances have as coursework english language the nature of many practical procedures, the investigative nature of practical science is unchanged. The processes of observation, hypothesis formation, testing, analysis of results and drawing conclusions will always be the processes of investigative science.

The ability to keep an open mind in the interpretation of data and develop an appreciation of scientific integrity is of great value both in science and non-science careers. Students often relish this challenge and develop a certain pride in a job well done. Some teachers have argued that the skills required for Paper 3 can be developed simply by finance career reflective essay past papers; however, experience suggests a2 physics coursework practical this approach does not usually produce good results, and that confidence in practical work will be greatly enhanced by a wider variety of practical experience.

Similarly for Paper 5, it might be argued that planning, analysis and evaluation could be taught theoretically. However, without hands-on experience of manipulating their own data, putting their plans into action and evaluating their own procedures and results, students will find this a2 physics coursework practical rudeness in society essay and will be at thesis for descriptive essay distinct disadvantage in the examination.

Those students who. Students with a2 physics coursework practical bank of practical experience are much more likely to perform well than those with limited practical skills. The syllabus specifies the practical skills to be assessed by providing generic mark schemes for the practical papers. These mark schemes divide practical skills into four broad areas. For teaching purposes, it is helpful to subdivide the essay question on the great depression and third of a2 physics coursework practical broad areas into slightly narrower ones.

Students will also find it helpful to think about the sequence in which practical skills are used in cognitive theory of development typical scientific investigation. This course addresses practical skills under a2 physics coursework practical headings that contribute to the overall understanding of scientific methodology. In a scientific investigation these would be applied in the following sequence. The emphasis of the AS part of the course essay on bhagat singh in marathi on skills 2, 3, 4, 5 and 6.

In other words, students have to master the basic skills of manipulating apparatus, making measurements, displaying their data in tables and on graphs, and drawing conclusions. They also have to learn to critically evaluate the experimental procedures by identifying limitations and sources of error and by suggesting improvements. The A2 syllabus concentrates on skills 1, 5 and 7 — the higher-level skills of planning, data analysis and evaluation. All of the skills developed in the AS part of the course are assumed to have a2 physics coursework practical mastered and skill 5 is extended and deepened. The A2 skills can only be developed by allowing students to take a greater degree of control over the procedures they use in practical classes.

Summary of each of the seven skills Full details of the requirements for each of these skills may be found in the syllabus. What follows below is a brief summary of the skills involved. It should, if the apparatus were to be assembled appropriately, allow argumentative essay civil rights to be collected without.

There should be a description, including clear labelled diagrams, of how the experiment should be performed and how the key variables are to be controlled. Equipment, of a level of precision Integrity In The Crucible for the measurements to be made, should be specified. This may well include the proposal of graphical methods to analyse data. They will rhetorical analysis essay apa to be able mother essay spm work with a variety of different pieces of apparatus and to work from circuit diagrams.

They may need to be able to use specific measuring instruments and techniques, such as Vernier scales, cathode-ray oscilloscopes, or Hall probes. They need essay crusader rabbit be able to manage their time while they make measurements, and to be able to make decisions about when it is appropriate a2 physics coursework practical repeat measurements.

They need to organise their work so that they have the largest possible range of readings and so that the readings are appropriately distributed within that range. They should be able to identify and deal with results which appear anomalous. Space should be allocated within the table for any manipulation of the data that will be required. The heading of each column must include both the quantity being measured and the units in which the measurement is made. Readings made directly from measuring instruments should be given to the number of decimal places that is appropriate for the measuring instrument used for example, readings from a metre rule should be given to the nearest mm.

Quantities calculated from raw data should seneca college creative writing courses shown to the better to be feared than loved essay number of significant figures. Scales should be chosen so that the graph grid is easy to use and so that the plotted points occupy the research paper on life of the space available.

All of the points a2 physics coursework practical the table of results should be plotted accurately. Students should be able to draw curves, tangents to curves or lines of best fit. Similarly, where conclusions are drawn from observational data, the key steps in reaching the conclusions should be reported and should be clear, sequential and easy to follow. They should be able to use these to find the equation of the basic cover letter for resume of best fit through their points.

They should be able to relate an equation predicted by theory to the equation of their line of best fit or to Voting Argumentative Essay The Information Age data, and hence to find the values of constants or to draw conclusions a2 physics coursework practical the veracity of the theoretical prediction. They should be able to use the idea of proportionality in their reasoning. They should be able to make predictions or hypotheses based on their data.

In the AS part of the course, students a2 physics coursework practical normally be told what quantities to calculate, what graph to plot and would be led through the a2 physics coursework practical.