Concepts

Magnetic induction, transformers

Overview

This is a transformer with swappable secondary coils, which all step down from the wall outlet 120 V_RMS.

Details

Equipment

• [1] Dissectible transformer with 800-turn primary coil
• [1] 40-turn coil
• [1] 80-turn coil
• [1] 200-turn coil
• [1] Multimeter & leads

Classroom Assembly

1. Assemble the transformer with the desired secondary coil.
2. Attach the multimeter to the secondary coil.
3. Set the multimeter to AC volts at an appropriate scale.
   

Important Notes

• Some of the secondary coils are hard to attach to and remove from the iron core. Try not to hurt yourself doing this.

Script

1. Turn on the multimeter.
2. Plug in the transformer.
3. Note the voltage across the secondary coil.
4. Change the secondary coil and repeat 1–3 as required.
5. Unplug the transformer.
   

Additional Resources