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 a fuse protect us?

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


Question 2. Which pin in a UK plug should connect to the blue wire?

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


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

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


Question 4. How does an RCCB protect us?

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


Question 5. What is the earth wire connected to inside the appliance?

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


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