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Subject:Circuits
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- A good rule-of-thumb to estimate the expected life of a motor, a ballast, or other electrical equipment is that for every ____________ C above rated temperature, the expected life will be cut in __________________.The resistance of 120 mtrs. of wire is 12Ω. What is its conductance?Find the conductance of 1000ft of #12 AWG wire made of A.copper b. aluminum
- A copper transmission line is to be replaced by one of aluminum having the same total resistance. If the cross sectional area of the copper wire is 0.005m2 , what would be the cross sectional area of the new aluminum wire? Note: DRAW THE DIAGRAMa copper bus bar carrying 1200A has a voltage drop of 1.2mV along 24cm of its length. What is the resistance per meter of the bar?Find the value of Rv (in ohms) needed for a full-scale reading of 250 mV.
- A copper transmission line is to be replaced by one of aluminum having the same total resistance. If the cross sectional area of the copper wire is 0.005m2 , what would be the cross sectional area of the new aluminum wire? *Draw the diagramA given wire has a resistance of 17.5 ohms. If its length is 560m, how much length must be cut off from the wire in order to reduce its resistance to 12.5 ohms. assume to cross sectional area of the wire to be constantFind the conductance of 1000 ft long #12 AWG wire made up of aluminium.
- An aluminum wire replaces a copper wire with the same value of resistance. If the crosssectional area of the copper wire is 500 CM, find the cross sectional area of the aluminumwire in SM.Calculate the temperature coefficient of resistance of aluminum at 300C and uses it to find the resistance of an aluminum wire at 700C if the wire has a resistance of 40 Ω at 300Determine the equivalent resistance for the network below