1. Work done is measured in
- A) joules
- B) watts
- C) coulombs
- D) newtons
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2. Which of these is NOT a type / form of energy?
- A) chemical
- B) gravitational potential
- C) geothermal
- D) kinetic
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3-11.
A light bulb changes |
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energy into useful |
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energy. |
A petrol engine changes |
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energy into useful |
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energy. |
Most of the energy wasted is lost as |
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energy. |
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A microphone changes |
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energy into useful |
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energy. |
A human muscle changes |
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energy into useful |
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energy. |
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A motor on a train converts 60 000J of electrical energy into 45 000J of kinetic energy.
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| 12. How much energy is wasted? |
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| 13. What is 60 000J in kJ? |
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| 14. How efficient is the motor? |
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| 15. If it converts this energy in 15 seconds, what is the useful power output? |
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16. 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
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17. A tractor pulls a plough 2km across a field using a force of 8kN. What is the work done? |
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18. If the same tractor produces the same force and does 2MJ of work, how far did it go? |
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19. What is 0.45MJ in joules? |
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20-21. What are the missing labels on this energy flow diagram for a radio?
Electrical Energy
5000J |
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Thermal energy
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800J |
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