A 500.0 kV power line is delivering 250.0 MW of power. It consists of a copper wire has a radius of 4.126 mm and is 125.3 km long. What percentage of the power is lost in the power lines if the temperature of the wire is 23.3°C? The resistivity of copper is p = p. (1+a (T-20)) with p. = 1.68x10-8 Nm and a = .0039(°C-¹). Assume 3 significant digits. Note that the percentage of power lost is given by (Plost/Pdelivered)* 100

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.