Edexcel iGCSE - Energy

Page 1

 

1. Work done is measured in

  • A) joules
  • B) watts
  • C) coulombs
  • D) newtons
 

2. Which of these is NOT a type / form of energy?

  • A) chemical
  • B) gravitational potential
  • C) geothermal
  • D) kinetic
3-9.
A light bulb changes
energy into useful
energy.
A petrol engine changes
energy into useful
energy.
Most of the energy wasted is lost as
energy.
 
A microphone changes
energy into useful
energy.

 

A motor on a train converts 60 000J of electrical energy into 45 000J of kinetic energy.

 

10. What is 60 000J in kJ?
11. How efficient is the motor?
12. If it converts this energy in 15 seconds, what is the useful power output?

13. What is the formula for work done?

  • A) Work done = F x d
  • B) Work done = F / d
  • C) Work done = m x a
  • D) Work done = m / a

14. A tractor pulls a plough 2km across a field using a force of 8kN. What is the work done?

15-16. What are the missing labels on this energy flow diagram for a radio?

Electrical Energy

5000J

800J

 

 

Thermal energy