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
Explanation
Correct Option
aVideo Explanation
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Anela
1 year ago
Eff.= power output/power input
Efficiency=80/100
power output=50
power input= 200i
80/100 = 50/200i
CROSS MULTIPLY
=16000i = 5000
DBS BY 16000
i=5000/16000
= 0.31(ANS)
RECALL; POWER=IV
FOR THE POWER OUTPUT,IT HAD ALREADY BEEN SIMPLIFIED,BUT FOR THE POWER INPUT ONLY "V" WAS GIVEN AND WE WERE TOLD TO FIND CURRENT(I)
