Question

A 10 V storage battery of negilgible internal resistance is connected across a 200V battery and a resistance of `50 Omega` resistor made of alloy manganin. How much heat energy is produced in the resistor in 1 h? What is the source of this energy?

Answer 1

Here, `V = 10 V, R = 50 Omega`,
`t = 1 h = 60 xx 60 s`,
Heat energy produced in 1 h is
`H = (V^(2)t)/R = ((10)^(2) xx ( 60 xx 60))/50 = 7200 J`
The source of this energy is the chemcal energy stored in the cell.