High voltage is defined as any voltage over 1000 volts. Three example circuits were shown for operating LEDs from supply voltages below 1.5 Volts. The voltage went up to 450 volts. It provided a voltage of 1.4 volts. It has an operating voltage of roughly 1.1 volts. A high-voltage power supply is one that outputs hundreds or thousands of volts. The NEC covers voltages up to 600 volts. Hz is common for LV [low voltage, under 600 Volts AC] VFDs. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007). For instance, lithium cells with a voltage of 3 volts are commonly available. "C" battery, which had taps for various voltages between 1.5 volts and 9 volts. The ignition system provides initial 50,000 volts and 1.2 amperes. These batteries all operate from 1.35 to 1.45 volts. Redox potential is measured in volts (V), or millivolts (mV). This is equal to the product of root-mean-square volts and amperes.