... The result of this bulb at operating temp, is R = V/l = 220V/ 0.454 A = 484 ft R = v2 / P = 484 n The maximum current available from an individual circuit is limited by the resistance of the wires. The l2R power loss in the wires carries them to become hot, and extreme cases this can cause fire or melt the wires. ... Protecting against overloading of circuits is provided by fuses or circuit breakers or fuse boxes.
|Title||:||Science and technology IV|
|Publisher||:||Rex Bookstore, Inc. -|