By John O'Malley
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The wire resistance at 20 C can be found and used in the temperature coefficient of resistance formula. m, the wire resistance at 20 C is The only other quantity needed to calculate the wire resistance at 35 C is the temperature coefficient of resistance of aluminum at 20'C. 003 91 C - '. 63 R Derive a formula for calculating the temperature coefficient of resistance from the temperature Tl of a material and To, its inferred zero resistance temperature. In R , = R , [ l + a , ( T 2 - T 1 ) ] select T,= To.
A n open circuit is sometimes called an o p n . A short circuit is the opposite of an open circuit. It has zero voltage across it for any finite current flow through it. On a circuit diagram a short circuit is designated by an ideal conducting wire a wire with zero resistance. A short circuit is often called a short. Not all open and short circuits are desirable. Frequently, one or the other is a circuit defect that occurs as a result of a component failure from an accident or the misuse of a circuit.
Ans. 75 V What is the resistance of a 240-V, 5600-W electric heater? Ans. 23 mA ( h ) orange-white-orange-gold, ( c )red-black-blue-missing Find the tolerances and nominal resistances corresponding to color codes of ( a ) brown-brown-silvergold, (b) green-brown-brown-missing, and ( c ) blue-gray-green-silver. Am. 4 V when delivering 6 A. What is the internal resistance of the battery? Ans. 1 R A 3-hp automobile electric starter motor operates at 85 percent efficiency from a 12-V battery. What is the battery internal resistance if the battery terminal voltage drops to 10 V when energizing the starter motor?
Schaum s outline of theory and problems of basic circuit analysis by John O'Malley