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?

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


Question 2. What is the earth wire connected to inside the appliance?

The power switch of the appliance.
The metal case or body of the appliance.
The neutral power connection of the appliance.
The live components of the appliance.


Question 3. Which pin in a UK plug should connect to the fuse?

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


Question 4. How does a fuse protect us?

It melts when a large current flows, breaking the circuit.
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 predicts large currents, then disables the device.


Question 5. 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 would cost more to use an earth connection.
It only needs a 3A fuse.


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