Electricity

Question 1

E

Answer 1

I2RT

Question 2

V

Answer 2

C

Question 3

The fuse

Answer 3

If the current exceeds the fuse rating, the wire inside the fuse melts. This breaks the circuit and the appliance is no longer live. So isn’t dangerous.

Question 4

The earth wire

Answer 4

This is attached to the outer metal case of the appliance. If the live wire touches the case, current flows through the earth wire. The surge j. Current melts the fuse wire and the appliance becomes safe.
Yellow and green

Question 5

Circuit breaker

Answer 5

When current increases too much, the circuit breaker breaks the circuit. The circuit breaker is better than a fuse because it can be re-set easily and breaks the circuit quicker than a fuse.

Question 6

Ammeter in…

Answer 6

Series

Question 7

Voltmeter in…

Answer 7

Parallel

Question 8

Insulation

Answer 8

Electrical wires are covered by an insulator. Insulators do not conduct electricity because they don’t contain free charge carries.

Question 9

Double insulation

Answer 9

Hair drier has this cuz of its plastic case, box inside a box

Question 10

Direct current

Answer 10

Flows in one direction.

Question 11

Alternating current

Answer 11

current changes direction continually

Question 12

Sources of direct current include

Answer 12

Batteries

Question 13

Mains electricity is..

Answer 13

Alternating current

Question 14

M

Answer 14

mega x10 6

Question 15

k

Answer 15

Kilo x10 3

Question 16

m

Answer 16

milli x10-3

Question 17

n

Answer 17

nano x10-9

Question 18

u (with weird line)

Answer 18

X10-9 micro

Question 19

Power =

Answer 19

Current x voltage

Question 20

Power measured in

Answer 20

Watts, W

Question 21

Current measured in

Answer 21

Amps, Are