A 4:1 step-up transformer receives 120VAC in its primary and has 1600 Ohms resistance in its secondary. What is the current drawn from the source?
- 3 A.
- 1.2 A.
- 0.3 A.
Explanation
A 4:1 step-up transformer raises 120 V to 480 V on the secondary. With 1600 ohms in the secondary, secondary current is 480/1600 = 0.3 A. Power is conserved, so primary current is the secondary current times the turns ratio, 0.3 x 4 = 1.2 A drawn from the source.
davide_gibbo asking:
Why 1.2? I think it's 0.3(480/1600)
Community Comments (1)
M
Maks_avcom Posts: 1 15.05.2024 / 02:59
Pls, do one more step, find current of primary coil \source connected to primary\, P=UxI, 120xI1=0.3x480, I1=1.2A.
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