Volts are a unit of measurement for electric potential difference, which indicates how much electrical energy is available to move electrons through a circuit. One volt is defined as the potential difference that will drive one ampere of current against one ohm of resistance. This concept is essential in understanding how electrical devices operate. In practical terms, higher voltages can push more electrical current through a circuit, making them crucial for powering various devices. For example, standard household outlets in many countries provide 120 volts or 240 volts, which is sufficient to run appliances like refrigerators and televisions.