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Electrical energy

Electrical devices

Device Useful energy Energy wasted
Light bulb Light energy Heat energy
Electric heater Thermal energy Light energy
Hairdryer Thermal energy and Sound
kinetic energy

Electrical power

The energy supplied to a device per second is the power supplied
to it.
The more powerful a device, the…

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Total cost = number of kWh used x cost per kWh

The National Grid

Electricity in the home reaches you through the National Grid.
The National Grid contains power stations and transformers.
Step-up transformers are used at power stations and increase the
voltage to the National Grid.
Step-down transformers are…


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