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  Voltage Tester Screwdriver

Introduction to Voltage Tester Screwdriver:

A test light, voltage tester, test lamp, or mains tester is a extremely simple piece of electronic test equipment that is employed to ascertain the existence or nonexistence of an electric voltage in a piece of equipment under test. This is displayed in the below diagram.

The test light is just an electric lamp connected along with one or two insulated wire leads. Frequently, it obtains the shape of a screwdriver along with the lamp connected among the tip of the screwdriver and a single lead which projects out the back of the screwdriver. Through connecting the flying lead to an earth or ground reference and touching the screwdriver tip to several points in the circuit, the existence or nonexistence of voltage at every point can be ascertained and easy faults detected and traced to their root cause. For low voltage work for instance, in automobiles, the lamp employed is generally a small, low-voltage incandescent light bulb. These lamps generally are planned to work on about 12 V. For line voltage or mains work, the lamp is generally a small neon lamp connected in series with a suitable ballast resistor. These lamps frequently can work across an extensive range of voltages from 90 V up to various hundred volts. In a number of cases, various separate lamps are employed with resistive voltage dividers arranged to permit additional lamps to strike like the applied voltage increases higher; along with the lamps mounted in order from lowest voltage to highest, this minimal bar graph gives a crude indication of voltage.

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