Bright Tutorials Bright Tutorials
ICSE Class 10 Physics Question 19 of 20

Solved 2017 Question Paper ICSE Class 10 Physics — Question 15

Back to all questions
15
Question

Question 9(c)

(i) Explain the meaning of the statement 'current rating of a fuse is 5A'. [4]

(ii) In the transmission of power, the voltage of power generated at the generating stations is stepped up from 11 kV to 132 kV before it is transmitted. Why?

Answer

(i) Current rating of a fuse is 5A, implies that if the current in a circuit having this fuse in the live wire exceeds 5A, it blows off and the circuit becomes incomplete without damaging the appliance connected in that circuit.

(ii) The power generated at the generating station is stepped up from 11 kV to 132 kV before transmission so as to reduce the magnitude of current to 112\dfrac{1}{12}th of it's value so that the heating loss of power in the line wires used for transmission are reduced [since heat produced ∝ (current)2]