# Questions tagged [power]

The time rate of change of energy

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### Power of a Hydraulic Pump and Rate at which Kinetic Energy is imparted to the water

Suppose there is a Horizontal pipe of Length $L$ which pumps water through an end with a speed $v$, there is no friction. A pump is on the opposite side. So what will the rate at which of kinetic ...
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### Maximizing power, current, voltage

We're asked to maximize voltage across the resistor RL, then do the same for current and power. But to find a value of R that maximizes VL, I think we'd just say infinity. And to maximize current ...
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### Why is the brightness of a light bulb dependant on power?

If: Temperature is a measure of the average (kinetic) energy of the particles which make up some material Power is measure of energy transferred per second (J/s) The temperature of the filament in a ...
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### Why does current flow through the ground rod if lightning strikes the breaker box?

In normal functioning of household power supply, the current flows through the hot and the neutral wire. Why does it not take the path of the ground rod, even when the ground rod, neutral wire and the ...
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### Modified affinity laws - effect of motor efficiency

I have a problem regarding the affinity law that describes the relation between power and fan speed. If I am not mistaken, this is applicable if the motor efficiency is constant. In my case it is ...
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