In a heat engine, if the input heat is 1000 J and the work done is 300 J, what i

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Question: In a heat engine, if the input heat is 1000 J and the work done is 300 J, what is the efficiency of the engine?

Options:

Correct Answer: 30%

Solution:

Efficiency is calculated as η = (Work output / Heat input) * 100%. Here, η = (300 J / 1000 J) * 100% = 30%.

In a heat engine, if the input heat is 1000 J and the work done is 300 J, what is the efficiency of the engine?

In a heat engine, if the input heat is 1000 J and the work done is 300 J, what is the efficiency of the engine?

Step 1: Identify the input heat, which is given as 1000 J.
Step 2: Identify the work done by the engine, which is given as 300 J.
Step 3: Use the formula for efficiency, which is η = (Work output / Heat input) * 100%.
Step 4: Substitute the values into the formula: η = (300 J / 1000 J) * 100%.
Step 5: Calculate the fraction: 300 J / 1000 J = 0.3.
Step 6: Multiply by 100% to find the efficiency: 0.3 * 100% = 30%.
Step 7: Conclude that the efficiency of the engine is 30%.

Efficiency of Heat Engines – Efficiency is the ratio of useful work output to the heat input, expressed as a percentage.