Electricity and D.C. Circuits

Which of the following is the basic SI unit for electric charge?

• ampere

• coulomb

• ohm

• volt

There is a current of 0.24 A through a lamp for 40 minutes.

How much charge passes through the lamp?

• 576 C

• 9.6 C

• 0.60 C

• 0.01 C

When a resistor is connected across a battery of 2.8 V there is a current of 0.35 A.

What is the resistance of the resistor?

• 8.00 Ω

• 1.02 Ω

• 0.98 Ω

• 0.13 Ω

A car headlamp when connected to a 12 V battery converts energy at a rate of 50 W.

How much energy is converted when it is switched on for 5 minutes?

• 2 J

• 120 J

• 300 J

• 15 000 J

A current of 2.0 A passes through a component of resistance 24 Ω.

What is the rate of energy transfer?

• 6 W

• 12 W

• 48 W

• 96 W

The diagram shows part of a circuit.

What is the current X ?

• 0.6 A

• 2.0 A

• 4.8 A

• 6.2 A

The diagram shows a junction in a circuit.

What is the current Y ?

• + 0.2 A

• - 0.2 A

• + 1.8 A

• - 1.8 A

The diagram shows a circuit. The current in the circuit is 0.8 A. What is the e.m.f of the cell E₂?

• 0.56 V

• 0.80 V

• 2.80 V

• 4.80 V

A student is to measure the resistance of a lamp. Which circuit should he use?

• A

• B

• C

• D

The diagram shows a network of resistors. What is the total resistance between points P and Q?

• 1.8 Ω

• 4.0 Ω

• 8.7 Ω

• 18.0 Ω