Energy transfers & efficiency

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Presentation transcript:

Energy transfers & efficiency Energy can never be made or destroyed; it can only be changed from one form into another During an energy transfer, some energy is wasted. The less wasted energy, the more efficient the device Energy is normally wasted as heat energy to the surroundings Efficiency = Useful energy changed / Total energy supplied Energy transfers & efficiency

Forms of Energy Forms of Energy

Energy transfers Energy transfers

Electrical Energy Electrical energy

Energy efficiency Energy efficiency

Energy efficiency Energy efficiency

Energy efficiency Energy efficency

Energy is measured in Joules (J) Work done Energy is measured in Joules (J) When a force moves an object, energy changes from one form to another and work is done Work done = Force x Distance Work done

Work done Work done

Work done Work done

Work done Work done

Power is measured in Watts or kilowatts Power = Work done / Time taken Power is a measure of how fast the energy changes from one form to another. It is the rate at which work is done Power is measured in Watts or kilowatts Power = Work done / Time taken 1 Watt means that 1 Joule of energy was changed in 1 second Power

Power Power

Power Power

Kinetic energy is the energy of a moving object Kinetic energy increases with greater mass and greater speed Kinetic energy = ½ x mass x speed Kinetic energy

Kinetic Energy Kinetic energy

Gravitational Potential energy Electrical energy can be changed into gravitational potential energy Gravitational potential energy is the energy stored in an object because of its height above ground Weight = mass x gravitational field strength Gravitational potential energy = Weight x Height Gravitational Potential energy

Kinetic and Potential energy

Gravitational Potential energy

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