What determines the rate of energy transfer in a circuit? - OCR 21C

1

How much energy is transferred by a 250 W television set in 4 minutes?

2

If 25 C of charge shifts 50 J of energy between two points, what is the voltage between those points?

3

What power is transmitted by a current of 2 A in a resistor with a potential difference across it of 5 V?

4

What power is transmitted by a current of 2 A in a 6 Ω resistor?

5

What is the power output of a mains transformer with a current of 0.2 A passing through it?

6

The power input into a transformer of 100 per cent efficiency is 2,000 W. What will the power output be?

7

The power input of a transformer is 1,200 W and the output voltage is 120 V. What will the output current be?

8

How is electricity transmitted across the UK?

9

Why is electricity transmitted around the country at 400,000 V?

10

If a 6 V cell transfers 36 J of energy around a circuit, how much charge has flowed?