Week 5 homework

What is the safety voltage for a human body?

• 36V

• 220V

• 3V

• 10V

What is an electric tester used to measure?

• hot wire

• voltage

• current

• resistance

A fuse is an equipment to prevent home circuits from_____?

• overcurrent or short circuits

• being cut down

• being switched off

• taking too many loads

In a home circuit, there are three wires, hot wire, ground wire and ______?

• neutral wire

• earth wire

• live wire

• lead-in wire

In a home circuit, a(n) ________ follows the lead-in wire to measure how much energy has been consumed by this residential or business.

• energy meter

• voltmeter

• ammeter

• breaker

How many metal rods does an electrial tester have?

• Two

• One

• Four

• Three

Look at the socket. The upper pin is connected to ________.

• earth wire

• live wire

• neutral wire

• none of them is correct

Look at the socket. The left pin is connected to ________.

• neutral wire

• hot wire

• ground wire

• none of them is correct

Look at the socket. The right pin is connected to ________.

• hot wire

• earth wire

• neutral wire

• none of them is correct

If you are standing on the ground and one part of your body is touching ________, you will experience a single-line electric shock, which is extremely dangerous.

• live wire

• neutral wire

• ground wire

• earth wire