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What is the formula to calculate the power (W) of a sine wave electrical signal traveling through a wire if I know the frequency, voltage, and current?

Thanks,

Jason O

- Thread starter Jdo300
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- #1

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What is the formula to calculate the power (W) of a sine wave electrical signal traveling through a wire if I know the frequency, voltage, and current?

Thanks,

Jason O

- #2

NoTime

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Unless you just want to know how much power the wire is consuming.

In which case you need R_wire.

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berkeman

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- #4

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So you are saying that a wire carrying 100 volts at 60Hz has the same amount of power as a wire carrying 100 volts at 120Hz or 1kHz (assuming the same load in all three cases)? I heard somewhere that if you double the frequency of the wave, that the power is 4 times as much, is that true?berkeman said:

Thanks,

Jason O

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NoTime

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Wave shape will make a difference in power.

Frequency only becomes important (if the load is resistive) as it gets high enough for the skin effect to make a significant contributation.

Since you seem primarily interested in coils then note that P=V * I does not apply to what you are doing.

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follow the links

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powerac.html#c1

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/powerac.html#c1

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/acres.html#c2

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NoTime

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Since the OP seems to be contemplating square waves the page 2 doesn't really apply to him.

A square wave reflects the sum of a large number of

different frequency sine waves.

This can be tricky in inductive circuits.

Perhaps Jdo should coinsider geting a function genenerator that can produce sine waves.

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