GCSE AQA Physics: Power and Energy Transfers

What is the formula to calculate power?

• P = mgh

• P = F/d

• P = V/I

• P = W/t

A machine does 500 J of work in 10 seconds. What is its power?

• 50 Watts

• 250 Watts

• 1000 Watts

• 100 Watts

Which of these athletes would have the most powerful muscles?

• Triathlete

• 1500 m runner

• Weightlifter

• Pole vaulter

Which of these devices would consume the most power?

• Laptop

• Electric kettle

• LED light bulb

• Mobile phone charger

Which of these devices would consume the least power?

• Electric heater

• Desktop computer

• LED light bulb

• Television

What is the unit of power?

• volt

• ampere

• ohm

• watt

A car engine transfers 2000 J of energy in 5 seconds. What is its power?

• 1000 W

• 100 W

• 400 W

• 500 W

What is the principle of conservation of energy?

• Energy cannot be created or destroyed, only transferred or transformed.

• Energy can only be transferred.

• Energy can only be transformed.

• Energy can be created and destroyed.

A motor does 1000 J of work in 2 seconds. What is its power?

• 500 Watts

• 200 Watts

• 100 Watts

• 300 Watts

A machine transfers 800 J of energy in 4 seconds. What is its power?

• 200 watts

• 100 watts

• 400 watts

• 600 watts