A transformer's primary winding connected to a DC battery of 10 V draws 1 mA. The transformer has 50 primary turns and 100 secondary turns. Determine the steady-state secondary voltage and current.
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A transformer's primary winding connected to a DC battery of 10 V draws 1 mA. The transformer has 50 primary turns and 100 secondary turns. Determine the steady-state secondary voltage and current.

G1 Physics · Accepted Answer

Step 1: Transformer action requires changing magnetic flux in its core, so induced secondary emf follows εₛ=−Nₛ(dΦ/dt). Step 2: Steady DC current creates a constant magnetic field; after transient dΦ/dt=0. Step 3: Secondary terminal voltage is zero, so no sustained secondary current flows. Answer C. Final answer: (C) 0 V and therefore no current.