Current Electricity and Electrical InstrumentHard
Question
A battery of internal resistance 2W is connected to a variable resistor whose value can vary from 4W to 10 W. The resistance is initially set at 4W. If the resistance is now increased then -
Options
A.Power consumed by it will decrease
B.Power consumed by it will increase
C.Power consumed by it may increase or may decrease
D.Power consumed will first increase then decrease
Solution
P = I2R = 
ε is constant and (R + r) increases rapidly Then P ↓
ε is constant and (R + r) increases rapidly Then P ↓
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 wire has resistance of 24Ω is bent in the following shape. The effective resistance between A and B is -...The resistance of all the wires between any two adjacent dots is R. The equivalent resistance between A and B as shown i...A galvanometer of 100Ω resistance gives complete deflection on flowing 10 mA current. What should be the value of s...Which of the following is scalar : -...In the circuit shown, the current in the 1Ω resistor is :-...