GCSEPhysWrkPwrEnrgCards13

Question 1

The equation linking work or energy (E) with power (P) and time (t)

Answer 1

E = Pt

Question 2

The unit for power

Answer 2

Watt (W)

Question 3

Defining equation for work done

Answer 3

W = Fs

Question 4

equation for percentage efficiency of a device or process:

Answer 4

percentage efficiency = 100 x useful energy output / energy input

Question 5

Defining equation for kinetic energy

Answer 5

KE = 1/2 x mv²

Question 6

Defining equation for gravitational potential energy

Answer 6

GPE = mgh

Question 7

The unit for work or energy is the …?

Answer 7

Joule (J)

Question 8

The Principle of Conservation of Energy

Answer 8

Energy cannot be created or destroyed. It can only be changed from one form into another.

Question 9

When energy is changed from one form into another, some is always changed into …?

Answer 9

heat

Question 10

The kind of energy stored in a stretched or compressed spring

Answer 10

elastic potential energy

Question 11

The kind of energy stored in a battery

Answer 11

chemical energy