the maximum active power that can be theoretically delivered at a given frequency by a source having an impedance of positive real part to a directly connected load when the impedance of the load is widely varied
NOTE 1 – The available power is obtained when the resistance of the load is equal to that of the source and its reactance is equal in magnitude but of opposite sign.
NOTE 2 – In some cases, conditions such as overheating or overvoltage prevent the available power from being obtained.
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