Physics-
General
Easy
Question
A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true
- Potential difference across the terminals of the battery is maximum when R = r
- Power delivered to the resistor is maximum when R = r
- Current in the circuit is maximum when R = r
- Current in the circuit is maximum when
The correct answer is: Power delivered to the resistor is maximum when R = r
For power to be maximum
External resistance = Equivalent internal resistance of the circuit
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