Electricity power GCSE

If a charge flows through a resistor, which of the following happens to the resistor?

• It gets colder

• It gets hotter

• It becomes positively charged

• Nothing

In a filament lamp, in what form is most of the energy lost?

• Heat

• Sound

• Kinetic energy

• Radio waves

What is power?

• The number of repetitions of squats a body-builder can perform

• The number of cylinders in a car

• The rate at which energy is absorbed

• The rate at which energy is transferred

What is the formula for power?

• P = E⁄t

• P = t⁄E

• P = E⁄2t

• P = 2E⁄t

Calculate the power of an appliance that uses 1000 joules of energy in 5 seconds.

• 100 W

• 200 W

• 300 W

• 400 W

Power, potential difference and current are correctly related by which equation?

• P = I x V

• P = 2I x V

• P = I⁄V

• P = I⁄2V

What is the voltage of an appliance if it uses 200 J per second when supplied with a current of 5 A?

• 10 V

• 20 V

• 30 V

• 40 V

Which equation correctly shows the relationship between energy transferred, voltage and charge?

• E = V x Q

• E = 2V x Q

• E = V⁄Q

• E = Q⁄V

What is the energy transferred if the voltage is 5 V and the charge is 10 C?

• 50

• 25

• 50 J

• 25 J

What size of fuse would be required for a 230 V, 500 W heater?

• 3 A

• 5 A

• 13 A

• 1 A