Snapquiz - Household Electrical Safety

This is the Snapquiz on Household Electrical Safety. Click here or use the embedded video if you haven't watched the lesson yet.

Question 1. What is the normal potential difference of the neutral wire?


Question 2. Why might an appliance not need to use the earth wire?

It would cost more to use an earth connection.
It only needs a 3A fuse.
It's double-insulated (non-conductive body) and low power.
It uses an AC supply.

Question 3. If an appliance draws a 4A current which standard fuse value (for the UK) should be used in its plug?


Question 4. Which pin in a UK plug should connect to the fuse?

Bottom right.
Top centre.
Any - it doesn't matter.
Bottom left.

Question 5. How does a fuse protect us?

It limits large currents, only allowing a set amount of current to flow.
It detects when a large current flows, switching off the power.
It melts when a large current flows, breaking the circuit.
It predicts large currents, then disables the device.

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