In a heat engine, if the input heat is 800 J and the work output is 300 J, what

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Question: In a heat engine, if the input heat is 800 J and the work output is 300 J, what is the efficiency?

Options:

Correct Answer: 62.5%

Solution:

Efficiency = (Work output / Heat input) × 100 = (300 J / 800 J) × 100 = 37.5%.

In a heat engine, if the input heat is 800 J and the work output is 300 J, what is the efficiency?

In a heat engine, if the input heat is 800 J and the work output is 300 J, what is the efficiency?

Step 1: Identify the heat input, which is given as 800 J.
Step 2: Identify the work output, which is given as 300 J.
Step 3: Use the efficiency formula: Efficiency = (Work output / Heat input) × 100.
Step 4: Substitute the values into the formula: Efficiency = (300 J / 800 J) × 100.
Step 5: Calculate the fraction: 300 J divided by 800 J equals 0.375.
Step 6: Multiply 0.375 by 100 to convert it to a percentage: 0.375 × 100 = 37.5%.
Step 7: Conclude that the efficiency of the heat engine is 37.5%.

Efficiency of Heat Engines – Efficiency is a measure of how much useful work is obtained from the input heat energy in a heat engine.