power and energy

Question

Hello,
There is something I don’t get about power and energy.
If I got it right, power is expressed in Watts or Joules ans energy is in Watts.hours.
So if I buy à power supply rated at let’s say 700W. Does that mean (assuming, for the sake of the argument 100% efficiency and 100% load) it also consumes 700Wh ? And also that 700W is it’s maximum power output ?

In: 2

Answer 1

>power is expressed in Watts or Joules ans energy is in Watts.hours.

Watts is power, that’s correct.

Energy is Joules.

1 Joule = 1 Watt – second.

Energy can also be expressed in Watt-hours as you mentioned, or as kilojoules.

>So if I buy a power supply rated at let’s say 700W. Does that mean (assuming, for the sake of the argument 100% efficiency and 100% load) it also consumes 700Wh ? And also that 700W is it’s maximum power output ?

The supply doesn’t consume the 700Wh, the 100% load does. 700W is the maximum power output (that’s correct).

HTH