Maximum power is delivered when internal resistance of the source equals:
Correct answer: B. Load resistance
- A. Zero resistance
- B. Load resistance
- C. Max resistance
- D. None of these
Explanation
The maximum power is delivered when the internal resistance of the source equals the load resistance.This is known as the maximum power transfer theorem. The theorem states that the maximum power that can be transferred from a source to a load is achieved when the resistance of the load is equal to the resistance of the source.The reason for this is that when the resistance of the load is equal to the resistance of the source, all of the power generated by the source is used to power the load. If the resistance of the load is less than the resistance of the source, then some of the power generated by the source is lost in the internal resistance of the source. If the resistance of the load is greater than the resistance of the source, then some of the power generated by the source is lost in the load.So, to achieve maximum power transfer, the resistance of the load should be matched to the resistance of the source.The maximum power is not delivered when the internal resistance of the source equals zero resistance, max resistance, or none of these. The maximum power is delivered when the internal resistance of the source equals the load resistance.
Last updated
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
0.75 A current flows through an iron wire when a battery of 1.5 volts is connected across its ends. The length of the wire 5.0 m and its cross-sectional area is 2.5 x 10^-7 m2. What is the resistivity of iron?
1.6 mA current is flowing in conducting wire then the number of electrons flowing per second
1 kilo ohm = _ ohm
1 microvolt is
1/Req = 1/Rl + 1/R2 + 1/R3 + ..... +1/Rn is the combination in