What are the UK mains voltage and frequency?

• About 12 V at 50 Hz
• About 230 V at 50 Hz
• About 230 V at 5 Hz

How does mains alternating current differ from cell direct current?

• AC swaps direction many times a second, DC flows one way
• AC flows one way, DC swaps direction
• Both flow one way but AC is stronger

The earth wire normally carries no current and only acts in a fault.

Circle one:   True   False

That 10 A kettle needs a fuse. Which rating do you pick?

• 3 A
• 5 A
• 13 A

A 2300 W kettle runs at 230 V. What current does it draw in amps? Type the number.

Answer: ______________

A fault joins live to a metal kettle case. What happens first?

• The neutral wire melts at once
• The earth wire carries the surge away from the case
• The supply voltage drops to 12 V

A lamp looks off but its case is live. What wiring fault explains it?

• The fuse rating is too high
• The earth wire is too thick
• The switch breaks neutral instead of live

A learner keeps fitting bigger fuses because the right one keeps blowing. What should they do instead?

• Fit the biggest fuse that fits the plug
• Get the appliance fixed, since a fault is blowing the fuse
• Remove the fuse and rely on the earth wire