Q.1.
What is the useful form of energy produced by a kettle?
Q.2.
What is the useful form of energy produced by a radio-controlled car?
Q.3.
Which equation can be used to calculate the amount of energy transferred from a mains supply?
Q.4.
If a kettle uses 3 kW of power when it is switched on and is on for 2 minutes, how much energy is transferred during the period?
Q.5.
An electric cooker heating element converts electricity to heat, but what else is also produced in this process?
Q.6.
What is the power of an appliance that uses 5 kWh in 15 minutes?
Q.7.
If 1 kWh of energy costs 15 pence and an appliance with a power rating of 10 kW is switched on for 20 minutes, how much will the appliance cost to run for this amount of time?
Q.8.
On what does the amount of energy an appliance transfers rely?
Q.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?
Q.10.
An iron, a kettle and a computer all produce what type of energy?