Unit 17 Current of Electricity Quiz (21MIN)

A circuit has 1250 C flowing through it for 25 seconds. What is the current in the circuit?

• 25 A

• 50 A

• 1250 A

• 6.25 × 10²³ A

What is the time taken when the amount of 1500 C flows through a fixed point to give a current of 10 A?

• 1.5 minutes

• 2.0 minutes

• 2.5 minutes

• 3.0 minutes

Study the circuit below.

What is the voltage V in the circuit?

• 2 V

• 4 V

• 16 V

• 32 V

Four identical resistors are used in a circuit. Which of the following arrangements gives rise to the lowest effective resistance?

• A

• B

• C

• D

In which unit is potential difference measured?

• ampere

• ohm

• volt

• watt

When the potential difference (p.d.) across a piece of resistance wire is changed, the current through the wire also changes. The temperature of the wire stays the same. Which graph shows how the p.d. and the current are related?

• A

• B

• C

• D

Which diagram shows possible currents at a junction in a circuit?

• A

• B

• C

• D

Calculate the energy required to drive 10 C of charge across two points with a potential difference of 20 V.

• 0.5 J

• 2.0 J

• 20 J

• 200 J

Why are birds able to perch on overhead transmission lines without being electrocuted?

• Their feet are insulated.

• There is no potential difference between their feet.

• They have very high resistance.

• They perch on wires of different potential.

The diagram below shows an electric circuit. Which of the following shows the correct set of ammeter and voltmeter readings when the circuit is connected to a power supply?

• I = 0.5 A, V = 9.0 V

• I = 0.6 A, V = 9.6 V

• I = 1.0 A, V = 8.0 V

• I = 1.0 A, V = 10.0 V