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Timer
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| A timer is a specialized type of clock. A timer can be used to control the sequence of an event or process.
A simple digital timer. The internal components—including the circuit board with control chip and LED display, a battery, and a buzzer—are visible.
Timers can be mechanical, electromechanical, digital, or even software, since most computers include digital timers of one kind or another.
Mechanical Timers
Early mechanical ... |
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Utility frequency (Mains Frequency)
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| The utility frequency (American English) or mains frequency (British English) is the frequency at which alternating current (AC) is transmitted from a power plant to the end user. In most parts of the Americas, it is typically 60 Hz, and in most parts of the rest of the world it is typically 50 Hz. Precise details are shown in the list of countries with mains power plugs, voltages and frequencies.
During the development of commercial ... |
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Insulated-gate bipolar transistor(IGBT)
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| The insulated-gate bipolar transistor or IGBT is a three-terminal power semiconductor device, noted for high efficiency and fast switching. It switches electric power in many modern appliances: electric cars, variable speed refrigerators, air-conditioners, and even stereo systems with digital amplifiers. Since it is designed to rapidly turn on and off, amplifiers that use it often synthesize complex waveforms with pulse width modulation and low... |
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Uninterruptible power supply
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| An Uninterruptible Power Supply (UPS), also known as an Uninterruptible Power Source, Uninterruptible Power System, Continuous Power Supply (CPS) or a battery backup is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available. There are three distinct types of UPS: off-line, line-interactive and double conversion (also called on-line).
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