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Terms in this set (33)
What is the main form of energy from a fire ?
What is the main form of energy from a torch ?
What is the form of energy used by a TV?
What is the form of energy coming from a radio?
What is the form of energy all moving objects have ?
What is the energy change in a kettle?
electrical → heat + sound
What is the energy change in a light bulb ?
electrical → light + heat
What is the name for stored energy?
What form of energy is stored in food, fuels and batteries ?
What form of energy is stored in atoms?
What form of energy is stored in a person at the top of a slide ?
What form of energy is stored in a stretched catapult ?
What is the energy change when wood is burned?
chemical → heat.(wood)
What is the energy change when a mobile phone is on?
chemical → electrical
What is the energy change when an apple falls off a tree?
gravitational → kinetic
What is the energy change when you climb up stairs ?
chemical → kinetic → gravitational
What is the Unit of energy?
If a car uses 5000J of chemical energy to make 4000J of kinetic energy how much energy is wasted ?
How do you calculate % efficiency of a machine
useful energy÷ starting energy x 100
What is the calculation for the % efficiency of a kettle that uses 100J of energy to make 80J of heat?
80÷100 x100 (=80%)
What does friction mean?
when kinetic energy of surfaces rubbing against each other is transformed into heat
When electric currents flow in wires what from of energy is produced?
How is electrical energy generated?
a moving magnet in a coil of wire
What fuels are used in the majority of our electricity generation?
What is the energy change in the boiler of a power station?
chemical → heat (boiler)
What is the steam used for in a power station?
to turn the turbines
What is the energy change in a generator ?
kinetic → electrical
Why do we need alternative ways of making electricity other than burning fossil fuels?
they are non-renewable and will run out
How does a nuclear power station differ from a fossil fuel power station?
the heat is made by a nuclear reaction rather than burning a fuel
How is a nuclear power station the same as a fossil fuel power station?
the heat boils water to make steam (the steam turns turbines the turbines turn a generator)
What are four examples of renewable sources of energy?
Wind, Hydroelectric, Solar, Wave
What is an advantage of wind energy?
renewable energy/does not produce waste gases
What is a disadvantage of wind energy?
unreliable as no wind = no energy/ people do not like the appearance of the turbines
THIS SET IS OFTEN IN FOLDERS WITH...
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