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Which form of energy increases if an object is lifted?
Gravitational Potential Energy (GPE)
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What do we call the law that says that "Energy cannot be created or destroyed"?
Conservation of energy
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What term do we use to describe wasted energy spreading out?
- Dissipation (process)
- Dissipated (what happens to the energy)
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What type of diagram is used to show the amount of useful and wasted energy in a device (or process)?
Sankey diagram
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What is the unit of electrical power?
Watt (W)
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What unit is the same as 1 joule per second?
Watt (W)
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Name 4 forms of energy
- Any four from:
- sound,
- thermal,
- light,
- kinetic (KE)
- strain,
- electrical,
- chemical,
- Gravitational Potential Energy (GPE)
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What form of energy is most wasted energy turned into?
Thermal energy (heat)
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What type of energy is stored in a squashed bouncy ball?
Strain energy
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What device transfers electrical energy into sound energy?
loudspeaker
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What name do we give to how quickly devices use energy?
Power
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What is the unit of time?
Seconds (s)
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What is "wasted" energy?
Energy that is not transferred into the form we want
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What is the maximum efficiency a machine can have?
100%
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How many joules are there in 3.5kJ?
3500
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What is the kilowatt hour (kWh) a unit of?
Energy (NOT power !)
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