A DC voltage cannot be step up (or) step down using a transformer . The transformer may start to smock & burn because, in the case of a DC supply, the frequency is zero.
Therefore, it is not advised to connect a DC supply to a transformer because, if a DC rated voltage is applied to the transformer’s primary coil, the flux generated in the transformer will not change in magnitude but rather remain the same.
As a result, EMF will not be induced in secondary coil except at the point of switching ON.
Since, the frequency of a DC supply is zero, applying voltage across a pure inductive circuit results in
If we set frequency to 0, the overall Xl (inductive reactance) will be zero as well.
To calculate current,
Use the formula
I = V/R (or I = V/Xl for inductive circuits) (Basic Ohm’s Law )
Therefore, a pure inductive circuit may start to smoke & burn if DC voltage is applied to it.
As a result, transformers cannot step up or step down a DC voltage.
Additionally, in such conditions, the primary coil will not experience self-induced EMF, which is only achievable with a variable flux linkage to counteract the applied voltage.
Since the primary coil has a low resistance, a high current passing through it will cause the primary coil to burn out from the extreme heat the current generates.
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