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CBSE Class 12-science Answered

Ajit had a high tension tower erected on his farm land. He kept complaining to the authorities to remove it as it was occupying a large portion of his land. His uncle, who was a teacher, explained to him the need for erecting these towers for efficient transmission of power. As Ajit realised its significance, he stopped complaining. Answer the following questions:                                                                                   (a) Why is it necessary to transport power at high voltage? (b) A low power factor implies large power loss. Explain. (c) Write two values each displayed by Ajit and his uncle
Asked by Topperlearning User | 10 Jul, 2015, 08:56: AM
answered-by-expert Expert Answer

(a) If high voltage is used to transmit power, then the current through the wire will be less as I = P/V. Hence, the power loss = I2R will also be less.

(b) The power is given as P = VI cosf, where cosf is the power factor.

To supply a given power at a given voltage of transmission, if cosf is small, then according to the above equation, current I has to be large. This leads to a large power loss caused by heat which is given as H = I2R. Hence, a low power factor implies large power loss.

(c) Values displayed by Ajit: Understanding in nature and proactive

Values displayed by uncle: Patience and intelligence

Answered by | 10 Jul, 2015, 10:56: AM

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