||A Unit is (1 Kilo Watt Hour 1Kwh). 1Kwh is equal to 4Amps running in your property for 1 Hour.
I own a Kettle which is a 3KW Kettle, so if my Kettle is on for 20 Minutes that will be equal to (1 Unit).
To work out KW (Kilo Watt) into Amps you divid the KW by Supply Voltage. For the UK that is 1000 (KW) / 230 (V) = 4.3Amps.
I have a 2.7KW Oven, so that will be
2700/230 = 11.7Amps