Processing math: 100%
Home / Aptitude Tests / Physics / A 40KW electric cabl...

A 40KW electric cable was uses to transmit electricity th...

A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

A.

4.0 x 102W

B.

5.0 x 102W

C.

4.0 x 103W

D.

5.0 x 103W

Correct answer is D

In general, Power = IV; 40KW=IVTherefore 40000=1×800I=40000800=50A,tune the current through

Resistor = 50A
power loss= I2R = 502 x 2
= 2500 x 2 = 5.0 x 103W