Electricity and Circuits Quiz

What is the definition of power in physics?

• The ability to do work

• The rate at which energy is transformed or work is done

• The total energy used over time

• The capacity to store energy

How is power measured in terms of energy and time?

• Power = Energy × Time

• Power = Energy + Time

• Power = Energy / Time

• Power = Time / Energy

What is the unit of power?

• Joule

• Watt

• Newton

• Volt

What does 1 watt equal in terms of joules and seconds?

• 1 joule per second

• 10 joules per second

• 100 joules per second

• 1000 joules per second

What is the formula used to calculate the power used by electrical appliances?

• P = IR

• P = VI

• P = V/R

• P = I/R

If a kettle uses a current of 10 A and is connected to a 230 V mains power, what is the power consumption of the kettle?

• 2300 W

• 230 W

• 23 W

• 23000 W

How much power does an induction cooktop use if it has a current of 32 A and is connected to a 230 V mains power?

• 7360 W

• 736 W

• 73.6 W

• 73600 W

Which of the following is an alternative form of the power formula P = IV?

• P = V/R

• P = IR × I

• P = I²R

• P = V + I

If a light bulb is connected to a 12 V battery and carries a current of 0.5 A, what is the power drawn by the bulb?

• 6 W

• 12 W

• 0.5 W

• 24 W

How much electrical energy is transformed in a bulb that is switched on for 2 minutes with a power of 6 W?

• 720 J

• 360 J

• 120 J

• 240 J