# Physics- P1.2

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- Created by: LaurenEvansx
- Created on: 07-08-16 23:07

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P1.2&3&4

**Elctrical Power**

- The power of a device is the energy transferred in one second. i.e the rate of energy transfer

**Costing Electricity**

- Kilo- watt hour is the amount of energy transferred by a one kilowatt appliance switched on for one hour,
- The amount of energy transferred to a mains appliance can be found using the equation: Energy (KWH) = Power (KW) x Time (H)
- The totak cost of the electrical energy supplied can be found using the equation: Cost= number of kilowatt- hours x cost per KWH

**Electricity from fuels**

- Powdered coal is blown into the furnace (Chenical- Thermal)
- The coal burns, heating up water in the boiler (Thermal- Kinetic)
- The water in the boiler becomes high pressure steam (Kinetic- Electrical)
- The high pressure steam turns the turbine
- The turbine turns a shaftconnected to the generator
- The…

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