Weegy: Hi there. The formula for power in watts is: Power = work/seconds. For electronics, power is calculated as:
P = I2R, or
P= V2/R, or
P= VI , where P is power, I is current, R is resistance, and V is voltage. (More)

All machines NOT 100% efficient because of C. friction

The villain of all machines is friction.Even with the best lubricants, there still exists some friction between moving parts in any machine. This transforms some of the energy into heat, and thus prevents it from being used to achieve the purpose of the machine.

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