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A device that initiates a flow of high voltage across the electrodes of a fluorescent lamp.

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Fluorescent Lamp Starter

A fluorescent tube has a heater at opposite ends of the tube. These are connected in series with the supply via a 'starter' (a small, heat-operated switch). When the tube is first switched on, current flows through the heaters which then act to ionise the gas within the tube. Once the gas is ionised, it begins to conduct and illuminate the tube. At this point the current flow through the heaters can be discontinued. This is done by the 'starter', a heat-operated switch, which opens a few moments after the current begins to flow. This arrangement is called a 'starter circuit' for a fluorescent tube.

Motor Starter

But there is also a 'starter' for an electric motor. Many motors cannot be started merely by connecting them to the supply. This is because, on starting, many motors demand a very large 'starting current' which reduces as the motor begins to turn. A motor 'starter' is used to restrict the amount of starting current until the motor runs up to speed.

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