Power in must equal power out, so the ____ current is more than the ____ current.

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Multiple Choice

Power in must equal power out, so the ____ current is more than the ____ current.

Power in equals power out, so P_in = P_out. For an ideal transformer, V_p I_p = V_s I_s, and in a step-down transformer the primary voltage is higher than the secondary. To keep the same power with a lower secondary voltage, the current on the output (secondary) side must be larger than the current on the input (primary) side. So the output current is greater than the input current.

Power in equals power out, so P_in = P_out. For an ideal transformer, V_p I_p = V_s I_s, and in a step-down transformer the primary voltage is higher than the secondary. To keep the same power with a lower secondary voltage, the current on the output (secondary) side must be larger than the current on the input (primary) side. So the output current is greater than the input current.

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