> Q. A transformer is used to light $140, W$, $24, V$ lamp from a $240,V$ ac mains. If the main current is $0.7, A$, the efficiency of the transformer is – LIVE ANSWER TODAY

Q. A transformer is used to light $140, W$, $24, V$ lamp from a $240,V$ ac mains. If the main current is $0.7, A$, the efficiency of the transformer is

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A transformer is used to light $140, W$, $24, V$ lamp from a $240,V$ ac mains. If the main current is $0.7, A$, the efficiency of the transformer is

Solution:

Output power $= 140,W$

Input power $= 240 times 0.7 = 168 ,W$

Efficiency $=frac{output ,power}{input, power}times100$

$=frac{140}{168}times100$

$=83.3%$

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