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Voltage is the power pressure that the utility company delivers. The voltage at a utility company's generating station starts out in the thousands of volts, but as it is transmitted through the grid and through substations, it eventually reaches a facility measuring in the hundreds of volts. The voltage varies by region and by application, and the standard voltages are called the nominal voltages. Some countries (the U.S. is one example) use both higher (208 V) and lower (120 V) voltages. In these cases, a facility's electrical panel is wired to either deliver the higher voltage straight to equipment, or is wired to split the higher voltage into separate lower voltage circuits. Frequency measures how many times per second power oscillates as it travels between the utility company and the facility. Frequency is dependent on the region. In North America, utility power completes 60 cycles per second (or 60 Hz). The voltage and frequency of the device must match the voltage and frequency of the outlet it is plugged into or the circuit it is hardwired to, otherwise the device will be damaged.
