Question

please anyone answer me i will mark you as brainliest​

Answer 1

Answer:

Electric power is the rate ,per unit time, at which electrical energy is transferred by an electric circuit.

The S.I unit of power is Watt.

The commercial unit of energy is. KW/h or and 1 kw/h is called 1 unit.

it is define as a 1kw power consumed in 1 hour.

Explanation:

1)

Given: DIAMETER of copper wire =0.5mm=5×10-⁴,resistivity= 1.6×10-⁸ohm,r=10ohm,L=?

we know that,

where R,D,L are the resistance, length and cross section area

$10 = 1.6 \times {10}^{ - 8} \times \frac{l}{\pi {r}^{2} }$

L=10×3.14×5×10-⁴×10⁸/1.6

L=10×3.14×6.25/1.6

L=112.656

so,length will be 122.656mm