A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?
a
57.20%
b
66.60%
c
83.30%
d
92.50%
e
100%
Explanation
Correct Option
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The1WHIZ1
2 years ago
Not sure if this is correct but i solved mine like this :)
Efficiency = output/input x 100%
Output power = 24W
Input power = IV = 0.120 x 240 = 28.8W
24/28.8 × 100%
= 83.30%
Official_Damini
1 year ago
A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?
202210652973ET
2 months ago
My endeavour and labour, shall be surpassed by Favour.
By Eze Theophilus.(avoid plagiarism).
