A step-down transformer has a power output of 5... - JAMB Physics 2008 Question
A step-down transformer has a power output of 50 W and efficiency of 80%. if the mains supply voltage is 200 v, calculate the primary current of the transformer.
A
0.31 A
B
3.20 A
C
3.40 A
D
5.00 A
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Correct Option: A
Efficiency = (power output)/power input x 100%
= 1s VS x 100% 1p
Vp
∴ (80)/100 = (50)/IP x 200
I P = (50 x 100)/80 x 200 = 3.125 A
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