1. Applied Electrical Technology 1

2. Applied Electrical Technology 1
energy used = power x time applied
energy is in joules (J)
power is in watts (W)
time is in seconds (s)

3. Applied Electrical Technology 1
=
/
Power = work (energy) / time

4. Applied Electrical Technology 1
kW

5. Applied Electrical Technology 1
1 kW = 1 kWh for 1 hour
10 kW = 1 kWh in 6 min
1 Wh = 3600 J

6. Applied Electrical Technology 1
Example
Rating = 2504 W
Time = 2 hours
Answer in Joules
energy used = 2504 x 2 x 3600 s
= 18028800 J
Answer in kWh
energy used = 2.504 x 2
= 5 kWh