Answer / cruz

frequency is nothing but time period in inverse(eg for 50hz
time period is 1/50=20ms hence as frequency decreases the
time period increases resulting in larger current flow thus
increasing the dissipation)

I've descovered that when the earth wire in a domestic electrical installation is not connected back to the board (ground) a voltage of between 9-24v is is found to be present in the earth wire. When connected at the board there is no voltage - is this normal and why does it happen?

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