Why does a transformer not work with direct current

FAQ | Mar 31,2023

A transformer is an electrical device that works on the principle of electromagnetic induction to transfer electrical energy from one circuit to another. It consists of two coils of wire, called the primary and secondary, which are wrapped around a magnetic core. When an alternating current (AC) is passed through the primary coil, it creates a magnetic field that induces an alternating current in the secondary coil.

The key point to note here is that transformers work with alternating current (AC) only, and not with direct current (DC). This is because, in order for the transformer to induce a voltage in the secondary coil, the magnetic field created by the primary coil must change direction at a certain frequency. This change in direction happens naturally with AC, as the current alternates between positive and negative cycles.

However, with DC, the current flows in only one direction, so there is no change in direction of the magnetic field to induce a voltage in the secondary coil. Therefore, a transformer cannot work with DC.

In order to use a transformer with DC, you would need to convert the DC to AC using an electronic device called an inverter, which would then allow the transformer to work as normal.

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