- 1). Turn off the device that is producing the electricity you want to reverse. If it's a transformer, remove the plug from the wall socket; if it's a generator, press the stop button, or turn the switch to the "Off" position.
- 2). Locate the two terminals on the transformer or generator. Wires extend from the terminals to the device it powers, such as a motor. One of the terminals is labeled "+", meaning positive and the other "-", meaning negative. You're likely to find that the wires are colored red and black for positive and negative respectively.
- 3). Make a note of the colors of the wires that connect to the positive and negative terminals. Remove the wires from the terminals. Use a screwdriver to loosen the terminal screws holding the wires in place, then slide the wires out from under the screws using your fingers. If the wires have metal rings on the end, you need to completely remove the screws in order to disconnect the wires.
- 4). Attach the wire that was connected to the positive terminal to the negative terminal. Either slide the wire under the terminal screw using your fingers or place the ring on the terminal then replace the screw. Tighten the screw using a screwdriver.
- 5). Attach the wire that was connected to the negative terminal to the positive terminal. Slide the wire under the screw and tighten using a screwdriver, or place the metal ring on the terminal and replace the screw then tighten.
- 6). Turn on the transformer or generator. Either insert the plug into the wall socket, or if it's a generator, press the start button or turn the switch to the "On" position. The electrical supply is reversed and you notice that if the device you're powering is motorized, it's rotating the opposite way than it had before.
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