A 10:1 step up power transformer has 120 V, and 3A flowing through the primary, and 0.285 A flowing through the secondary what is the efficiency?
- 90%.
- 95%.
- 85%.
Explanation
Input power is 120 V x 3 A = 360 W. The 10:1 step-up raises the voltage to 1200 V, so output power is 1200 V x 0.285 A = 342 W. Efficiency is output over input, 342/360, which is about 0.95 or 95%. The other options misjudge the output power.
minnesota asking:
can somebody pls explain that with a formula
Community Comments (1)
D
dimky Posts: 514 27.12.2015 / 19:48
Power in primary = 120 * 3 = 360W.
Power in secondary = 1200 * 0.285 = 342W.
342/360 = 0.95
Power in secondary = 1200 * 0.285 = 342W.
342/360 = 0.95
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