The two most important formula that you need are:
V = IR
1 Watt = 1 Joules/Second Joules is Energy, so Power (Watts) is the rate of Energy (Joules) consumption (or production) |
Example 1:
How much current does a 100W household light globe use? Power = 100 Watts Voltage = 230 Volts Current (I) = P/V = 100/230 = 0.43 Amps Example 2: An industrial plant uses a 1000 kWh in an 8 hour day, on average what is the required power? 1000 kWh = 1000000 Wh P = Energy (kwh) / time (h) = 1000000/8 = 125000 Watts = 125 kW avg. |