The voltage and current in the primary of a transformer are 200V and 2Arespectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.
a
100%
b
90%
c
75%
d
50%
Explanation
Correct Option
cNo explanation available
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samuelokusanya
3 years ago
power supplied to primary cell= IV= 400w .......Pp
power developed in secondary=ps= 10×30= 300w
Efficiency=(Ps/Pp)×100% ; (300w/400w)×100%=75%
