GCSE Physics P5 (OCR)

What happens when two objects are rubbed together?

Objects with similar charges ______.

Objects with opposite charges ________.

Why does a charged rod pick up pieces of paper?

Are electrons negatively or positively charged?

What is electric current?

What is electric current measured in?

What is an electric current in metallic conductors?

In metal conductors there are ______ charges free to move.

In an insulator there are ____ charges free to move.

The ______ the voltage of the battery in a circuit, the ______ the current.

Components _______ the flow of charge between them.

The _______ the resistance in a circuit, the _______ the current will be.

Why can the resistance of connecting wires usually be ignored?

What happens when electric charge flows through a component?

What is power?

What is power measured in?

Power = _________ x _________

What happens to resistors when an electric current runs through them?

What effect does this heating have on a lamp filament?

How does the resistant of and LDR vary with light intensity?

How does the resistance of a thermistor vary with temperature?

What happens to the resistance if there are two (or more) resistors in series?

What happens to the resistance if there are two (or more) resistors in parallel?

What is resistance measured in?

Resistance = _______ / _________

How does the current through a component vary with voltage across it when the resistance stays the same?

How should a voltmeter be connected to measure the potential difference between any two chosen points?

What is the voltage across a battery the measure of?

What is potential difference?

How does the potential difference relate to the work done by a charge?

How does adding batteries in series effect the potential difference?

How does adding batteries in parallel effect the potential difference?

What happens to the current when two (or more) components are added in series to a battery?

What happens to the potential difference when two (or more) components are added in series to a battery?

What happens to the potential difference across a component when two (or more) components are added in series to a battery?

What happens to the potential difference if the resistance of one component is changed when two (or more) components are added in series to a battery?

What happens to the potential difference when two (or more) components are added in parallel to a battery?

What happens to the current when two (or more) components are added in series to a battery?

What is mains electricity produce by?

How do generators produce a voltage?

What happens when a magnet is moving into a coil of wire?

What happens if the magnet is moving out of the coil?

What happens if the ends of the coil are connected?

Describe how transformers are constructed.

What will a changing current in one coil of a transformer cause?

What can a transformer do?

Vs/Vp = Ns/Np

How is a magnet or electromagnet rotated within a coil of wire to produce a voltage across the ends of the coil?

How can the size of this voltage be increased?

How does the induced voltage across the coil of an a.c. generator change during each revolution of the magnet?

What is direct current?

What is alternating current?

Is mains electricity an a.c supply or a d.c supply?

Why is A.C used for mains electricity?

What voltage is mains domestic supply in the UK?

How can the size of the alternating voltage produced by a generator be increased?

A _______-______ ____ can exert a force on a permanent ______, or another _______-______ ______ nearby.

To make a motor, where is the current-carrying wire placed?

When placed here, what does the wire experience?

What happens if the current-carrying wire is parallel to the lines of force of a magnetic field?

How can the motor effect result in a turning force on a rectangular current-carrying coil placed in a uniform magnetic field?

What can the motor effect be used to produce?

How does a commutator work?