How much energy is transferred by a 250 W television set in 4 minutes?
1,000 J
60,000 J
62.5 J
If 25 C of charge shifts 50 J of energy between two points, what is the voltage between those points?
2 V
0.5 V
5 V
What power is transmitted by a current of 2 A in a resistor with a potential difference across it of 5 V?
2.5 W
10 W
0.4 W
What power is transmitted by a current of 2 A in a 6 Ω resistor?
12 W
3 W
24 W
What is the power output of a mains transformer with a current of 0.2 A passing through it?
46 W
1,150 W
The power input into a transformer of 100 per cent efficiency is 2,000 W. What will the power output be?
Less than 2,000 W
2,000 W
More than 2,000 W
The power input of a transformer is 1,200 W and the output voltage is 120 V. What will the output current be?
0.1 A
1 A
10 A
How is electricity transmitted across the UK?
At a high current and a low voltage
At a high current and a high voltage
At a high voltage and a low current
Why is electricity transmitted around the country at 400,000 V?
Electricity is generated at 400,000 V
This reduces the heating effect of the current in the transmission wires
Some large factories need to operate at 400,000 V
If a 6 V cell transfers 36 J of energy around a circuit, how much charge has flowed?
0.16 C
216 C
6 C