Anonymous
Anonymous asked in Science & MathematicsEngineering · 1 month ago

# Electrical power is proportional to which of the following? Current, Energy, Voltage or All of the above? ?

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• problem is that you have 4 variables, current, voltage, resistance, and time. Power is proportional to some of these but only if others are fixed, ie, do not change.

P = energy/time, so yes, if time is fixed

P = E²/R so no

P = I²R so no

but if R is not fixed,

P = EI, so if current is fixed, P is proportional to voltage

P = EI, so if voltage is fixed, P is proportional to current

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• All of the above (for a resistive load) assuming other factors remain unchanged

However, increasing current also increases voltage and vice versa. So simply increasing say current will increase power proportional to current squared. I.e. not proportional to current.

So, looking at it another way, Energy is the answer to the question (assuming the measurement time stays constant)

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• P = IE

THEREFORE, DIRECT PROPORTIONAL TO BOTH CURRENT AND VOLTAGE.

• amania_r
Lv 7
1 month agoReport

that assumes the voltage remains the same. But increasing the current increases the voltage.

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