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A transformer has a 240 volt primary that draws a current of 250 milliamperes from the mains supply. Assuming no losses and only one secondary, what current would be available from the 12 volt secondary?
5 amperes
Input Power (P_in) = Primary Voltage * Primary Current = 240 V * 0.250 A = 60 W. Assuming 100% efficiency, Output Power (P_out) = P_in = 60 W. Secondary Current = P_out / Secondary Voltage = 60 W / 12 V = 5 A.
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