Can I connect two 120v relay coils in series to use one on a 240v circuit? I think I can but wonder why polarity of the winding doesn't matter. On a transformer it does. Can you explain this . Thanks
Yes, you can connect two 120V relay coils in series to use them on a 240V circuit. When you connect the relay coils in series, the total voltage across the coils will be the sum of their individual voltages, which in this case is 120V + 120V = 240V.
Regarding the polarity of the winding, it doesn't matter for relay coils because they are designed to work with AC (alternating current) voltage. In AC circuits, the current continuously alternates its direction, meaning it changes its polarity. Therefore, the polarity of the winding doesn't affect the functioning of the relay coil.
However, in the case of a transformer, the polarity of the winding does matter because transformers are used to change the voltage level of AC power. The windings of a transformer are specifically designed to create a specific voltage ratio between the primary and secondary windings. Reversing the polarity of the winding in a transformer will result in a change in the direction of the current and will affect the output voltage level.
In summary, when working with relay coils in an AC circuit, the polarity of the winding doesn't matter due to the nature of AC current, whereas in transformers, the polarity is critical for achieving the desired voltage transformation.