All of this reminds me of the guy who was taking Electricity 101.
He was trying to remember the equation for power for a test.
His buddy said "Just remember 'twinkle, twinkle little star. Power is equal
to I(squared) R.'"
When the test results came back our student had not done very well.
"I got mixed up" he said. "All I could remember was ' Shining in the sky so
high, Power is equal to R(squared) I' "
Sorry about straying a little off topic. The devil made me do it.
Some good answers here...Might I just add that in a resistive circuit, as
posted, voltage and current are in phase so there is 0 phase angle between
voltage and current and thus no losses other than the resistance. In a
capacitive or inductive circuit there is reactance. The formula for
capacative reactance is 1 divided by 2pi*f*c and for inductive reactance it
is 2pi *f*l. As you can see, as the frequency goes up so does the reactance
of the circuit and thus the overall power is reduced. With typical AC power
the 60 cycles are constant so the only variable is the capacitance or
inductance of the circuit which will cause the current to lead or lag the
voltage and leave you with less power. Hope that helps........Ross
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