Edexcel GCSE Combined Science CP10 Electricity and circuits overview quiz quiz

The amount of energy transferred per unit of charge

The opposition to the flow of electric charge

The rate of flow of electric charge

The total voltage supplied by a battery

V = I / R

V = I + R

V = R / I

V = IR

3 A

12 A

0.33 A

8 A

The resistance of a conductor always increases as the current through it increases

At constant temperature, current is directly proportional to potential difference

The voltage across any component in a circuit is always exactly 230 volts

The power of a component equals the current multiplied by the voltage

The filament cools down, so the metal ions end up vibrating far less than before

The voltage across the filament steadily decreases as the current rises

The filament heats up, so the ions vibrate more and impede the electrons

The lamp behaves like a diode and only lets current flow one way

Different at every point

Zero

Shared between branches

The same at every point

The full supply potential difference across it

Exactly half of the total supply voltage across it

No voltage at all across it because it is in parallel

The same current flowing through it as every other branch

P = I / V

P = IV

P = V / I

P = I + V

200 J

200000 J

20000 J

2000000 J

Direct current at about 12 V and a frequency of 50 Hz

Alternating current at about 1000 V and a frequency of 50 Hz

Direct current at a steady 230 V with no changing frequency

Alternating current at about 230 V and 50 Hz

So each gets the full mains voltage and can be switched independently

So that all of the appliances share the supply current equally between them

So that the total resistance of the whole circuit is greatly increased

So that exactly the same current flows through each appliance in turn

A fixed resistor

A diode

A filament lamp

A battery