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- Purpose
- To show how a transformer works.
- Location
- Room 146; shelf N3, alligator clips on B2, Low voltage power supply on E5
- Description
- Set up as shown in top photo.
The outer coil has more turns then the inner coil, so to step up the voltage we will want to apply power to the inner coil. To step down the voltage we will want to apply power to the outer coil. Begin by connecting the inner coil to one light bulb and the outer coil to the other light bulb (top photo). Set the power supply and voltmeter to 6 V AC, and apply about 4 amps of AC current to the outer coil and observe that the outer coil�s light bulb is bright, while the inner coil�s light bulb is dim (left photo). Now apply the power to the inner coil and observe that the inner coil�s light bulb is bright, but the outer coil�s light bulb is a little brighter (right photo). You can move the inner coil in and out and observe as the outer coil�s light bulb varies in brightness. Use the voltmeter as a visualization of the step up & step down. (Attach the voltmeter to the coil that is not connected to the power supply.)
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