Which device is primarily used for adjusting electrical power?

The transformer is primarily used for adjusting electrical power by modifying voltage levels in an electrical system. It operates on the principle of electromagnetic induction, allowing it to either step-up (increase) or step-down (decrease) voltage levels while maintaining the overall power conservation. This capability is crucial for efficiently transmitting electricity over long distances, as higher voltages reduce the current in the transmission lines, minimizing energy losses due to resistance.

In practical applications, transformers are used in substations to convert high transmission voltages to lower distribution voltages suitable for residential and commercial use. This process is essential for ensuring the electrical system operates safely and reliably, making the transformer a key device in electrical power management.

While switches, breakers, and capacitors play important roles in electrical systems—controlling the flow of electricity, interrupting circuits for safety, and managing reactive power respectively—none of these devices primarily focus on the adjustment of electrical power levels as directly and effectively as a transformer does.