Daniel B. answered • 12/10/20
Tutor
4.9
(204)
A retired computer professional to teach math, physics
Energy E is the product of power and time.
E = 2900 W x 50 min = 2900 W x 3000 s = 8,700,000 J
Daniel B.
tutor
The original question referred to 50 min = 3000s because each minute has 60 seconds, and 50x60 = 3000.
If the power is 5,500W and time 20 min, then the energy is
5,500x(20x60) = 6,600,000 J
Report
05/07/23
Jacob M.
The answer has to be kwh
Report
05/07/23
Daniel B.
tutor
If you want to convert from Joules to kWh then use the identity
1kWh = 3,600,000 J
For example, 8,700,000 J = 8,700,000/3,600,000 kWh = 2.4 kWh
Report
05/08/23
Jacob M.
Where do you get 3000s from? An electric clothes dryer is rated at 5,500 W. How much energy does it use in 20 min?05/07/23