Electricity Revision Recall Quiz 2

True or False?

"The UK mains electricity supply is direct current."

• True

• False

A current is flowing through a diode in a circuit. How would the current flowing change if the direction of the applied voltage was reversed?

• The current would not change.

• The current would not flow any more.

• The current would increase.

A 0.5 A and a 1.5 A current flow into a junction. Current leaves the junction through one wire. What is the current in this wire?

• 1 A

• 2 A

• 3 A

What is the correct definition of voltage?

• Energy transferred per unit charge passed.

• The rate of flow of charge.

• The rate at which energy is transferred.

True or False?

"An ammeter must be connected in parallel with a component to measure the current through the component."

• True

• False

Resistors A and B are connected in series with a power supply. Resistor A has a resistance of 3 Ω. Resistor B has a resistance of 9 Ω.

What is the total resistance in the circuit?

• 6 Ω

• 3 Ω

• 12 Ω

Components connected in parallel to a power supply will usually receive ...

• a fraction of the voltage of the power source

• the same current as any other component in the circuit

• the full voltage of the power source

Which of the following devices makes use of electrostatic charges?

• Fuelling hoses

• Plotting compass

• Photocopiers

True or False?

"It is not necessary to earth a double insulated appliance."

• True

• False

Electric current is ...

• the driving force that pushes charges around a circuit

• a measure of how much charges slow down as they flow through a circuit

• the rate of flow of charge