Free Maximum Power Output MCQs with Answers
10 Maximum Power Output MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Maximum power output describes the condition in which a source with internal resistance delivers the greatest power to an external load. The topic uses P = I²R and related circuit equations to show that maximum power occurs when load resistance equals internal resistance. This differs from maximum efficiency, which occurs under a separate condition.
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10 questions
- A. the load resistance is much larger than the internal resistance
- B. the load resistance equals the internal resistance of the source
- C. the load resistance is zero
- D. the internal resistance is zero
Explanation: Matching the load to the internal resistance maximises the power delivered, though the efficiency at that point is only 50 per cent, since…
Correct answer: the load resistance equals the internal resistance of the source- A. I squared R, VI, or V squared over R
- B. IR only
- C. V squared R
- D. I over R
Explanation: All three forms follow from P equals VI combined with Ohm's law, and which one is most convenient depends on what the question gives you.
Correct answer: I squared R, VI, or V squared over R- A. power
- B. energy
- C. current
- D. resistance
Explanation: A kilowatt hour is one kilowatt sustained for one hour, that is 3.6 million joules, and it is the unit an electricity meter records…
Correct answer: energy- A. a higher resistance
- B. a lower resistance and draws more current
- C. the same resistance
- D. a lower current
Explanation: At a fixed voltage, power is V squared over R, so a higher power rating means a lower resistance and therefore a larger current.
Correct answer: a lower resistance and draws more current- A. oo
- B. 0
- C. R
- D. R/2
Explanation: The maximum output power is delivered to a load resistance ( R ) when the internal resistance ( r ) of the source is equal to the load…
Correct answer: R- A. r = 0
- B. r = R
- C. r < R
- D. r > R
Explanation: The condition for maximum power transfer from a source of emf to an external circuit occurs when the load resistance ( R ) is equal to the…
Correct answer: r = R- A. I only.
- B. III only.
- C. I and II.
- D. I and III.
Explanation: To achieve maximum power dissipation in an external resistance connected to a dry cell with internal resistance, the effective internal…
Correct answer: I only.- A. R > r
- B. R < r
- C. R = r
- D. R = 1/r
Explanation: Maximum Power Transfer occurs when the resistive value of the load is equal in value to that of the voltage source's internal resistance.
Correct answer: R = r- A. Pmax = E2/4r
- B. Pmax = 4rE2
- C. Pmax =VIT
- D. Unlimited
Explanation: Factual recall from PTB. See explanation attached.
Correct answer: Pmax = E2/4r- A. E2/4r
- B. E2/2r
- C. E2/5r
- D. E2/3r
Explanation: The Maximum Power Transfer Theorem in electrical circuits states that to transfer the maximum amount of power from a source (like a…
Correct answer: E2/4rMaximum Power Output MCQs: common questions
Are these Maximum Power Output MCQs free?
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How many Maximum Power Output MCQs are on this page?
There are 10 Maximum Power Output MCQs in the Physics bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Maximum Power Output MCQ have an explanation?
Yes. Each Maximum Power Output question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
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