Energy

Question 1

Define work. And it’s unit.

Answer 1

Work is force multiplied by displacement. The unit is the Joule.
1J = 1N x 1m

Question 2

Define energy.

Answer 2

Energy is the ability to do work. The unit is the Joule.

Question 3

Define kinetic energy.

Answer 3

The kinetic energy of an object is the energy it has due to its motion.

Question 4

Define Potential Energy.

Answer 4

The potential energy of an object is the energy it has due to its position, shape or state.

Question 5

Define Power. Define the unit.

Answer 5

Power is the rate at which work is done. The unit of power is the watt.
1 W = 1J/1s

Question 6

What is the formula for % efficiency?

Answer 6

Power Output/ Power Input x 100

Question 7

Define the law of conservation of energy.

Answer 7

Energy cannot be created or destroyed but can only be converted from one form to another.

Question 8

How many joules are in 1 kilowatt hour or 1 electrical unit?

Answer 8

1000W x 3600s = 3,600,000 Joules of Energy