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 6J
1.2 × 10 6J
40000 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