# Practical Electricity_4NA_Part Ia

## Quiz by Jessica Lew

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- Q1
A torchlight consists of a light bulb and a 5.00 V battery. A current of 0.5 A passes through the bulb. Calculate the the power of the bulb

Users enter free textType an Answer60s - Q2
Calculate the electrical energy(J) supplied to the bulb in three minutes.

Given: V= 4.5 V, I= 0.2 A, time = 180 s

162

36

0.9

60s - Q3
An air conditioner rated 2 kW, 240 V is switched on for 20 minutes.

Power: 2000 W

Voltage: 240 V

time: 20 minutes= 1/3 hour

Convert the power to kW

0.2 kW

200 kW

2 kW

2000 kW

60s - Q4
An air conditioner rated 2 kW, 240 V is switched on for 10 minutes.

Power: 2000 W

Voltage: 480 V

time: 10 minutes= 1/6 hour

Calculate the current required by the air conditioner

8.33 A

0.12A

4.17A

60s - Q5
An air conditioner rated 2 kW, 240 V is switched on for 10 minutes.

Power: 2000 W

Voltage: 480 V

Time: 10 minutes=10 x 60 = 600 s

How much electrical energy is used by the air conditioner?

2.4× 10

^{ 6}J1.2 × 10

^{ 6}J40000 J

60s - Q6
The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 480 V mains supply.

Given:

R = 30Ω

V= 480V

Find the current passing through the heating element

0.125 A

16A

8 A

60s - Q7
The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 480 V mains supply.

Given:

R = 30Ω

V= 480 V

Find the power of the heater

(Clue: use V=IR first to calculate I then use P=VI to calculate power)

8 W

1920 W

7680W

60s - Q8
The resistance of the heating element in a heater is 30 Ω. The heater is connected to a 240 V mains supply.

Given:

R = 30Ω

V= 240 V

P=1920 W

Calculate the amount of heat produced by the heater in one minute

115200 J

1920 J

60s - Q9
What is the SI unit for power?

Joules

Ampere

Watt

30s - Q10
What is the SI unit for Energy?

Watt

Ampere

Joules

30s