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A power series in mathematics (in one variable) is an infinite series of a certain form. It normally appears as the Taylor series of a known function.
Power dissipated by the entire series circuit = (voltage between its ends)2 / (sum of resistances of each component in the circuit). Power dissipated by one individual component in the series circuit = (current through the series circuit)2 x (resistance of the individual component).
Power Surge
If the arrow points up, it may refer to a power (the number to the left of the arrow would be raised to the power 3 in this case).
This is the series of integer squares, also known as perfect squares. It is one example of a "power law" series.