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. How does an RCCB protect us?

It compares the live and neutral currents and triggers if they're the same.
It compares the live and earth currents and triggers if they're the same.
It compares the live and earth currents and triggers if they're different.
It compares the live and neutral currents and triggers if they're different.


Question 2. What is the normal potential difference of the neutral wire?

110V.
0V.
50Hz.
230V.


Question 3. Why might an appliance not need to use the earth wire?

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


Question 4. How does a fuse protect us?

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


Question 5. Which pin in a UK plug should connect to the blue wire?

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


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