Welcome to the Quiz!
This quiz contains 8 questions from a mix of 1 subtopics.
resistance / fire / voltage / current
One risk in electric circuits is a surge in current. The sudden increase in can damage the appliance, cause a , or give an electric shock.
|
Which of the following safety features are used to protect against surges in current?
(Select all that apply)
Earth wires
Double insulation
Circuit breakers
Fuses
|
rating / high / low / description
Fuses have a thin wire which melts and breaks the circuit when the current is too .
The of a fuse is the current that will cause the fuse to break the circuit.
|
above / below
Generally you should use a fuse with a rating a few amps the recommended current for the appliance.
|
Which of these fuse ratings would be appropriate for a kettle that is designed to operate at 5 A of current?
3 A
5 A
8 A
15 A
|
Circuit breakers are like a ________ that can be reset after they break the circuit.
lamp
cell
fuse
|
How earth wires protect us from electric shocks:
live / neutral / earth / battery / casing
- The wire is connected to the casing of the appliance.
- If the live wire touches the appliance , the earth wire provides an alternative pathway for electricity to flow.
- This way, we don't get an electric shock from touching the live appliance casing.
|
An appliance has 'double insulation'. Therefore it most likely:
Has an earth wire, but no plastic casing
Has both plastic casing and an earth wire
Has a plastic casing, but no earth wire
Has neither plastic casing nor an earth wire
|