- Energy is measured in joules (J). This unit is used for all forms of energy.
- The efficiency of an appliance = useful energy transferred by the appliance
total energy supplied to the appliance
- No machine can be more than 100% efficient and the less energy wasted, the more efficicent the machine.
- Measures to make machines more efficient include reducing: friction, air resistance, electrical resistance, noise due to vibrations.
Comments
No comments have yet been made