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How to Reduce AC Voltage From 20V to 10V

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    • 1). Cut four segments of electrical wire, with each segment six inches long. Strip 1/2 inch of insulation from the ends of each wire segment. Verify that the AC power supply is off.

    • 2). Solder one end of the first wire to one of the terminals on the transformer primary (the "2" side of the 2:1 transformer). Solder one end of the second wire to the transformer's other primary terminal.

    • 3). Solder one end of the third wire to one of the terminals on the transformer secondary. Solder one end of the fourth wire to the transformer's remaining secondary terminal.

    • 4). Place one of the ring terminals over the loose end of the third wire, and solder the terminal to the wire. Place the other ring terminal over the loose end of the fourth wire, and solder the wire to the terminal.

    • 5). Attach the loose end of the first wire to one of the output terminals on the AC power supply. Attach the loose end of the second wire to the remaining output terminal on the AC power supply. Turn on the AC power supply.

    • 6). Turn on the voltmeter and set the scale to "Volts AC." Attach one of the voltmeter probes to the first ring terminal. Attach the remaining voltmeter probe to the second ring terminal. Check the voltmeter display; the voltage will be 10 volts.

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