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A transformer operates a 6.3 volt 2 ampere light bulb from its secondary winding. The input power to the primary winding is approximately:
13 watts
Output power (P_out) = Secondary Voltage * Secondary Current = 6.3 V * 2 A = 12.6 W. Assuming near 100% efficiency for approximation, Input Power (P_in) ≈ P_out = 12.6 W, rounded to 13 W.
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