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PHY 102 Test Compilation PHY 102 17 Objective Question
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Question

A transformer which is 80% efficient gives an output of 12V and 4A. What is the input power?
Options
A 13W
B 38W
C 60W
Correct Answer
D 154W
Correct Answer

Option C is the correct answer.

Detailed Explanation

Efficiency (η) of a transformer is defined as the ratio of output power (P_out) to input power (P_in):η = P_out / P_inFirst, calculate the output power:P_out = V_out * I_out = 12 V * 4 A = 48 WGiven the efficiency η = 80% = 0.80.Rearrange the efficiency formula to find input power:P_in = P_out / η = 48 W / 0.80 = 60 W.

Hint

Calculate the output power first, then use the definition of efficiency to find the input power.

Question Info

Course: PHY 102
Topic: Test Compilation PHY 102 17
Type: Objective
Difficulty: Not specified
Question 1097 of 1819
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