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Eddy currents produce heat which is a loss of power and lowers the efficiency of an inductor.
The amount of power delivered to the load of an amplifier as a percentage of the power required from the power supply. Also known as a static charge. A field or force that exists in the space between two different potentials or voltages. Also known as an electrostatic field. The charge possessed by an electron is negative while the charge possessed by a proton is positive.