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Purpose:To demonstrate the basic operation of a transformer and some related phenomena.
Procedure:This set-up can be used in many different ways, the most dramatic being "Jacob's Ladder". Using the 250 turn winding as a primary and the 23,000 turn as a secondary, a voltage of about 10 K volts is produced. When the copper wires are placed at the output of the secondary and the juice turned on, an arc will form between the wires and climb upwards until the distance between the wires is too great whereupon the arc will dissipate and another will immediately form at the bottom again, repeating the process. The light socket can be plugged into the secondary and lit, or different primaries and secondaries can be used with the variac to measure different voltages and currents.
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