Question 1

What is the useful form of energy produced by a kettle?

Accepted Answer

Heat

Answer

Light

Answer

Microwaves

Answer

Sound

Question 2

What is the useful form of energy produced by a radio-controlled car?

Accepted Answer

Kinetic energy

Answer

Light

Answer

Sound

Answer

Heat

Question 3

Which equation can be used to calculate the amount of energy transferred from a mains supply?

Accepted Answer

E = P x t

Answer

E = t ⁄ P

Answer

E = P ⁄ t

Answer

P = E x t

Question 4

If a kettle uses 3kW of power when it is switched on and is on for 2 minutes, how much energy is transferred during the period?

Accepted Answer

0.1kWh

Answer

0.2kWh

Answer

0.5kWh

Answer

1kWh

Question 5

An electric cooker heating element converts electricity to heat, but what else is also produced in this process?

Accepted Answer

Light

Answer

Radio waves

Answer

Sound

Answer

Kinetic energy

Question 6

What is the power of an appliance that uses 5kWh in 15 minutes?

Accepted Answer

20kW

Answer

1.25kW

Answer

10kW

Answer

5kW

Question 7

If 1kWh of energy costs 15 pence and an appliance using 10kWh is switched on for 20 minutes, how much will the appliance cost to run for this amount of time?

Accepted Answer

50p

Answer

35p

Answer

75p

Answer

25p

Question 8

What does the amount of energy an appliance transfers rely on?

Accepted Answer

Time and power

Answer

Resistance

Answer

Power and resistance

Answer

Time

Question 9

Two appliances are switched on at the same time; one appliance uses twice as much power as the other but is on for half the amount of time. Which appliance uses more energy?

Accepted Answer

They use the same amount of power

Answer

It's impossible to tell

Answer

The appliance which is switched on for the shorter period of time

Answer

The appliance which is switched on for the longer period of time

Question 10

An iron, a kettle and a computer all produce what type of energy?

Accepted Answer

Heat

Answer

Kinetic energy

Answer

Light

Answer

Radio waves

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