# IGCSE Energy

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1. How do you calculate the work done by moving an object through a distance?
Work = Force x distance
2. What is the unit of energy?
JouleĀ (J)
3. What name do we give to how quickly energy is transferred?
Power
4. What is the standard unit of time?
SecondĀ (s)
5. What is the unit of power?
• Watt (W)
• (1 Watt = 1 Joule per second)
6. What affects an object's Gravitational Potential Energy?
• Its height from the ground,
• mass
• the strength of gravity
7. What affects an objects kinetic energy the most?
Velocity

• since
• (doubling the velocity quadruples the KE)
8. What is the standard unit for mass?
KilogramsĀ (kg)
9. What is the difference between speed and velocity?
• Speed just has a size.
• Velocity has a size and a direction (a vector)
10. State the "principle of conservation of energy"
Energy cannot be created nor destroyed, only transformed from one form to another
11. When an object is lifted up, what type of energy is it given?
Gravitational Potential Energy (GPE)
12. What name is given to the energy of a moving object?
Kinetic Energy (KE)
13. When an object falls from a height, what energy transfer takes place?
Gravitational Potential Energy (GPE) is converted to Kinetic Energy (KE)
14. What form of energy is stored in coal?
Chemical
15. Name 9 forms of energy
• Kinetic
• Gravitational Potential
• Chemical
• Strain
• Nuclear
• Internal (thermal)
• Electrical
• Light
• Sound
16. Name the main stages in a fossil fuel fired power station
• Boiler - where water is heated into steam
• Turbine - turned by expanding steam
• Generator - produces electrical energy
17. Which renewable energy source generates electricity from heat in the ground?
Geothermal
18. Which renewable energy source generates electricity from the up and down motion of water?
Wave power
19. Name the renewable energy source that is very reliable and can produce large amounts of electrical energy
hydroelectric
20. State the two main problems caused by burning coal
• Production of carbon dioxide which leads to global warming
• Release of pollutants such as sulphur dioxide (which causes acid rain)
21. Is nuclear energy renewable or non-renewable?
Non-renewable (as the energy source is not being replaced so will eventually run out)
22. What is meant be a renewable energy source?
Energy sources that are being replaced and so won't run out
23. When a vehicle brakes and slows down, what has happened to the lost Kinetic Energy?
It has been converted to thermal energy (heat) in the brakes and is dissipated (lost to the surroundings)
 Author: SilcoatesScience ID: 300255 Card Set: IGCSE Energy Updated: 2015-04-08 15:03:05 Tags: IGCSE Physics Energy Folders: Description: IGCSE Physics Energy Show Answers: