What device is responsible for regulating the strength of an electric current?

The device that regulates the strength of an electric current is a voltage regulator. A voltage regulator maintains a constant voltage level to ensure that electronic devices operate within their required specifications. It is crucial in various applications to prevent fluctuations in voltage that could potentially damage sensitive equipment.

A transformer primarily changes the voltage level in an alternating current (AC) circuit rather than directly regulating it. Circuit breakers are designed to interrupt the flow of electricity in case of overload or short circuits, which is a safety mechanism but does not regulate current strength. An amplifier increases the power of a signal but does not provide any means of voltage regulation.

Understanding the functions of these devices highlights the specific role of a voltage regulator in managing current strength, ensuring the reliable and safe operation of electronic systems.