Physics- P1.2

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…