9B Electricity Dangers 18 questions

9B Electricity Dangers 18 questions

Assessment

Assessment

Gaser Wagdi

Physics

9th - 10th Grade

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18 questions

Show answers

1.

Multiple Choice

10 sec

1 pt

What is the function of a relay?

to allow a current in one circuit to operate a switch in another circuit

to prevent an electric shock by earthing a metal case

to protect a circuit by melting if the current becomes too large

to transform a d.c. voltage to a different value

2.

Multiple Choice

30 sec

1 pt

After some building work in a house, a bare (uninsulated) live wire is left protruding from a wall. What is the greatest hazard?

a fire

a fuse blows

an electric shock

no current flows

3.

Multiple Choice

20 sec

1 pt

The diagram shows a 10Ω resistor and a 20Ω resistor connected in a potential divider circuit.

4.0V

6.0V

8.0V

12.0V

4.

Multiple Choice

10 sec

1 pt

In the circuit shown, only one of the fuses has blown, but none of the lamps is lit. Which fuse has blown?

A

B

C

D

5.

Multiple Choice

10 sec

1 pt

In an electrical circuit, what is the purpose of a fuse?

to connect the metal case of an appliance to the earth

to cut off the electrical supply if the current is too large

to keep an electrical appliance dry in damp conditions

to maintain a steady voltage as the current varies

6.

Multiple Choice

10 sec

1 pt

The current in a kettle is 10A and it is protected by a 13A fuse. The owner of the kettle replaces the 13A fuse with a 3A fuse.

The fuse blows and the kettle is damaged.

The fuse blows and the kettle is undamaged

The fuse does not blow and the kettle works correctly.

The fuse does not blow but the kettle fails to work

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