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a copper wire of length 1km when connected to 200v power supply draws a current of 2A. if the resistivity of material is 1.72ohm.calculate cross sectional area of wire |
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Answer» Answer: V = IR V = 200 I = 2A R = 200/2 100 R = r*l/a R = 100 r = 1.72 L = 1000m 100 = 1.72*1000/a 100 = 1720/a 100a = 1720 a = 1720/100 a = 17.2 m^2 Hope you understand |
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