Energy
- Created by: is8ri089
- Created on: 05-03-15 16:24
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- Energy
- 9 Forms of Energy
- kinetic
- moving objects
- gravitational potential
- high up objects
- elastic potential
- stretched elastic band
- chemical
- coal and gas
- light
- sound
- thermal
- hot objects
- electrical
- nuclear
- kinetic
- Conservation of Energy
- Energy cannot be created or destroyed
- Energy is conserved in all energy transfers
- Friction and Wasted Energy
- Wasted energy is energy that is not usefully transferred.
- E.g. light is useful in a light bulb and heat is the waste energy.
- Friction occurs between moving objects and causes them to heat up.
- The kinetic energy is useful and heat is wasted.
- Wasted energy is energy that is not usefully transferred.
- Efficiency
- The efficiency of a device is how much of the total energy input is transferred into useful energy.
- The more useful energy, the more efficient the device.
- Can be represented by a sankey diagram
- Improving efficiency
- reducing friction
- lubricating moving parts with oil or grease
- use wires in circuits with as little resistance as possible
- the higher the resistance, the hotter the wire becomes
- reducing air resistance
- streamlining the shapes of moving objects
- reduce vibrations and noise
- tighten loose parts on the machine
- reducing friction
- 9 Forms of Energy
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