A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.
a
2.93A
b
3.16A
c
3.42A
d
25.60A
e
27.68A
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Classicboymoses
4 years ago
Np/Ns= Is/Ip
128/45 = 9/Ip
Ip = (9x45)/128
Ip = 3.16a
3.16a = 92.5%
Ip = 100
Ip = (100x3.16)/92.5
Ip = 316/92.5
Ip = 3.42ampere
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