In this problem, we're looking for the potential drop, V across the cable given by Ohm's law:
and electrical energy, E dissipated as thermal energy per hour given by:
, where P is the power and T is the time in seconds.
A copper transmission cable 100 km long and 10.0 cm in diameter carries a current of 125 A.
(a) What is the potential drop across the cable?
(b) How much electrical energy is dissipated as thermal energy every hour?
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