A 40KW electric cable was uses to transmit elec... - JAMB Physics 2007 Question
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 option: d
In general, Power = IV; ( \implies 40KW = IV \
\text{Therefore } 40000 = 1 \times 800\
\implies I = \frac{40000}{800} = 50A,\text{tune the current through} )
Resistor = 50A
power loss= I2R = 502 x 2
= 2500 x 2 = 5.0 x 10<sup>3</sup>W
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