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
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involve...A strip of copper and another germanium are cooled from room temperature to 80 K. The resistance of...The reading of Ammeter in ampere for following circuit is :-...In the following circuit diagram the value of resistance X for the potential difference between B and D is zero : -...The efficiency of a cell when connected to a resistance R is 60%. What will be its efficiency if the external resistance...