A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.
A
0.625A
B
1.600A
C
2.500A
D
6.250A
Verified Correct Answer: A.
Physical Principles & Numerical Solution
Efficiency = \(\frac{I_sV_s}{I_pV_p}\) x 100
Source: Myschool Past Questions Archive (Record #27667)