Question

1. which machine produced the most heat energy? *

test of fuel efficiency
machine | a | b | c | d
units of electrical energy consumed | 120 | 130 | 135 | 160
equivalent units of mechanical energy produced | 100 | 100 | 100 | 100
options: a, b, c, d

Explanation:

Step1: Understand Energy Conversion

To find heat energy, use \( \text{Heat Energy} = \text{Electrical Energy Consumed} - \text{Mechanical Energy Produced} \).

Step2: Calculate for Machine A

For A: \( 120 - 100 = 20 \).

Step3: Calculate for Machine B

For B: \( 130 - 100 = 30 \).

Step4: Calculate for Machine C

For C: \( 135 - 100 = 35 \).

Step5: Calculate for Machine D

For D: \( 160 - 100 = 60 \).

Step6: Compare Values

\( 60 > 35 > 30 > 20 \), so D has most heat.

Answer:

D