Current Electricity and Electrical InstrumentHard
Question
A cell of emf ε and internal resistance r drives a current i through an external resistance R.
Options
A.The cell is generating ε i power
B.Heat is produced in R at the rate ε i
C.Heat is produced in R at the rate ε i 
D.Heat is produced in the cell at the rate ε i 
Solution
current i = 
cell generating power = εi
Heat produced in R at the rate i2R = iR.
= εi 
Heat produced in r at the rate = i2r = εi
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