Revision checklist

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IGCSE Physics

Chapter 7

Realise the dangers of using mains electricity incorrectly.

Understand the steps taken to protect users from electric shocks – for example, use of insulators, earthing, fuses, circuit breakers and double insulation.

Understand that a current can cause an energy transfer, and give some examples of domestic uses of the heating effect.

Understand the phrase ‘power rating’ when applied to an electrical appliance and be able to use the equation P = I × V to determine the correct fuse to use with an appliance.

Use the equation E = I × V × t to calculate the total energy transferred by an appliance.

Recall and explain the difference between alternating current (ac) and direct current (dc).

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Revision checklist

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IGCSE Physics

Chapter 8

Identify some materials that are electrical conductors and some that are electrical insulators.

Recall that there are two types of electrical charge – positive and negative.

Understand that objects that are uncharged contain equal numbers of positive and negative charges.

Understand how the transfer of electrons between objects can cause them to become charged: objects that gain electrons become negatively charged and objects that lose electrons become positively charged.

Recall that opposite charges attract and similar charges repel, and use these ideas to explain how an electroscope works.

Recall how electrostatic charge can cause explosions when fuelling aircraft and tankers, and how this problem can be avoided.

Recall some uses of static electricity, including electrostatic paint spraying, inkjets, photocopiers and electrostatic smoke precipitators.

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Revision checklist

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IGCSE Physics

Chapter 9

Understand how the proportion of free electrons in a material determines whether a material is a conductor or an insulator.

Recall that current is a flow of charge.

Understand and use the equation Q = I × t

Recall that the voltage between two points is the number of joules of energy converted when 1 C of charge flows between them.

Recall that in series circuits: (a) there is only one path for the current to follow, (b) the current is the same everywhere, and (c) the current depends on the applied voltage and on the number and nature of other components.

Recall the different characteristics of series and parallel circuits, and explain why they are suitable for different applications.

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Revision checklist

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IGCSE Physics

Chapter 10

Describe qualitatively the effect of changing resistance on the current flowing in a circuit.

Understand that the size of the current that passes through a component depends upon the voltage across the component and its resistance, and use the equation V = I × R

Recall the special properties of thermistors, light-dependent resistors and diodes.

Describe an experiment to obtain voltage and current measurements for a number of components, construct I – V graphs and then interpret the shapes of these graphs.

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