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The primary winding of a transformer is the side that is connected to the power source. This winding is responsible for receiving the input voltage and is where the electrical energy enters the transformer. In a transformer setup, the primary winding generates a magnetic field when an alternating current flows through it. This changing magnetic field induces a voltage in the secondary winding, which is connected to the output load.
Connecting the power source to the primary winding allows energy to be transformed to different voltage levels in the secondary winding, depending on the turns ratio of the transformer. This function is crucial in power distribution systems, where transformers adjust voltage levels to ensure efficient electricity transmission over long distances.
Other options, such as the secondary winding, neutral point, and load side, are not connected to the power source; instead, they are part of the circuit that delivers the transformed power to the intended use or load.