Lesson 3: Buying Electricity

 MUST understand how electric current transfers energy  SHOULD calculate the cost of energy used  COULD use appropriate units of energy

 You need to be able to define the following:  Component  Unit of electricity

1)An electric current. 2)Some energy is changed in any energy transfer into non-useful forms of energy (e.g. heat), which spread to the surroundings. 3)Depending on the action the energy is used for, it can be used in very small amounts or very large amounts. 4)Units; equivalent to kWh (kilowatt-hours). 5)a) 1000 units; b) 1600 pence; c) £16 6)a) 7.5 kWh; 120p or £1.20 b) 0.25 kWh; 4p c) 0.36 kWh; 5.76p

3)Depending on the action the energy is used for, it can be used in very small amounts or very large amounts. 4)kWh (kilowatt-hours)