Which side of a transformer is represented by the symbol 'H'?

The symbol 'H' on a transformer represents the primary side, which is where the input voltage is applied. The primary side is responsible for receiving power from the source and creates a magnetic field in the transformer’s core. This magnetic field induces a voltage in the secondary winding, which is indicated by the symbol 'X'.

Understanding the roles of the primary and secondary sides is crucial in electrical systems because it helps in the correct application and analysis of transformer configurations. Knowing that 'H' signifies the primary side also assists in troubleshooting and ensuring that connections are made correctly to prevent operational issues. The primary side is essential for transforming voltage levels as per the requirements of the circuit, illustrating its importance in the broader context of electrical and instrumentation maintenance.