17 Electricity 2022J

A large battery is labelled with various items of information about the battery. 12 V 30 kg 216 kJ 680 A One of these items of information is the electromotive force (e.m.f.) of the battery. What is the e.m.f. of the battery?

• 12 V

• 30 kg

• 216 kJ

• 680 A

The circuit shown is being used to measure the resistance of resistor Z.

What is the correct combination of meter X and meter Y to determine the resistance of resistor Z?

• ammeter; ammeter

• ammeter; voltmeter

• voltmeter; ammeter

• voltmeter; voltmeter

The diagram shows the circuit diagram symbol of an electrical component.

Which component does the symbol represent?

• light-dependent resistor

• relay coil

• thermistor

• variable resistor

What is the advantage of connecting lamps in parallel in a lighting circuit?

• A smaller fuse is needed to protect the lamps.

• If the filament of one lamp breaks, the remaining lamps stay lit.

• The current taken from the supply is less.

• The lamps use less power.

The diagram shows a circuit of six identical lamps connected to a battery.

Which lamps are brightest?

• P only

• Q and R only

• S, T and U only

• P, Q, R, S, T and U are equally bright

Why is a fuse used in an electrical circuit?

• so that the current can have only one value

• to prevent the current becoming too large

• to provide a path to earth if a fault occurs

• to save electrical energy

Four circuits are set up.

In which circuit does the meter measure the potential difference (p.d.) across the resistor?

A resistor has a potential difference (p.d.) of 12 V across it and a current of 0.60 A in it. What is the resistance of the resistor?

• 0.05Ω

• 2.0Ω

• 7.2Ω

• 20Ω

Which circuit is correctly labelled?

Which statement describes the current from the power supply?

• greater than I_X and greater than I_Y

• greater than I_X and less than I_Y

• less than I_X and greater than I_Y

• less than I_X and less than I_Y