Advertisements
Advertisements
Question
Solve the following problem.
A battery after a long use has an emf 24 V and an internal resistance 380 Ω. Calculate the maximum current drawn from the battery? Can this battery drive starting motor of car?
Solution
Given: E = 24 V, r = 380 Ω
To find: i. Maximum current (Imax)
ii. Can battery start the motor?
Formula: Imax = `"E"/"r"`
Calculation: From formula,
Imax = `24/380` = 0.063 A
As the value of the current is very small compared to the required current to run a starting motor of a car, this battery cannot be used to drive the motor.
- The maximum current drawn from the battery is 0.063 A.
- The battery cannot be used to drive a starting motor of a car.
APPEARS IN
RELATED QUESTIONS
The internal resistance of a cell of emf 2 V is 0.1 Ω it is connected to a resistance of 0.9 Ω. The voltage across the cell will be ______.
Solve the following problem.
A battery of emf 12 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A,
- Calculate resistance of resistor.
- Calculate terminal voltage of the battery when the circuit is closed.
