Useful energy
- Created by: Ashley Fenn
- Created on: 20-02-14 14:49
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- USING ENERGY
- Forms of energy
- Chemical energy
- Kinetic energy
- Gravitational potential energy
- Elastic potential energy
- Electrical energy
- Nuclear energy
- Conservation of enrgy
- Energy cannot be created or destroyed
- Conservation of energy applies to all energy changes
- Useful energy
- Useful energy is energy in the place we want it and the form we need it
- Wasted energy is energy that is not useful enrgy
- Useful energy and wasted energy both end up being transferred to the surroundings, ehich become warmer
- as energy spreadsout, it gets more and more difficult to use for further energy transfer
- Energy and efficiency
- The efficiency of the device = useful energy transferred by the device / total energy supplied to the device (x 100%)
- No machine can be more than 100% efficent
- Measures to make machines more efficient include reducing friction, air resistance, electrical resistance and noise due to vibration
- Forms of energy
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