Question

What do the polarity dots on a transformer indicate? How is the direction of the flux determined?

A. The polarity dots indicate the primary and secondary windings of the transformer.
B. The polarity dots indicate the direction of the magnetic flux.
C. The polarity dots indicate the voltage polarity across the windings.
D. The polarity dots indicate the current flow direction in the windings.

Answer 1

The polarity dots on a transformer indicate the direction of the magnetic flux. The dot on the primary winding represents the starting point of the magnetic flux, and the dot on the secondary winding represents the direction of the induced magnetic flux. The direction of the magnetic flux can be determined using the right-hand rule.

Step-by-step explanation:

The polarity dots on a transformer indicate the direction of the magnetic flux. The dots are usually marked with a dot or a marking on one winding and a dot or a marking on the other winding. The dot on the primary winding represents the starting point of the magnetic flux, while the dot on the secondary winding represents the direction of the magnetic flux induced by the primary winding.

The direction of the magnetic flux in a transformer can be determined using the right-hand rule. If you grip the primary winding with your right hand, with your thumb pointing in the direction of the current, the fingers of your hand will curl in the direction of the magnetic flux. The dot on the primary winding will indicate the starting point of the magnetic flux.