Dynamo

Use a power supply (not shown) to run current through the 0.1m coils. Use the power supply shown to spin up disk to approx. 4000 rpm (Mike Brown can tell you how to determine the rpm). A potential difference between the outer rim of the wheel and the axel is induced and can be measured using a voltmeter.

Electromagnetic Induction (outreach set)

Demos in this set include:

When current through a solenoid changes, a magnetic field is induced within the solenoid. If two solenoids are concentric with each other, the induced field in one solenoid produces a changing current in the other.
Connect a power supply to one solenoid and a galvanometer to the other.
Unless steel rod is inserted in innermost cylinder (shown above), induced magnetic field is too week to produce a noticeable effect. Steel rod greatly enhances effect.

Location

Solenoids: L01, section B-2

Galvanometer: L35, section F-3

Power supply: L35, section F-1

Use principles of electromagnetic induction and Lenz’s Law
to explain why magnet rolls so slowly down metal incline.
Located in L01, section B2.

Move one coil past neodymium magnet (attached to wood) and the other coil responds by moving in or out.
Located in L01, section B3.

Purpose: Demonstrate the importance of electromagnetic induction
in the operation of generators and motors.
Motors (right photo) consist of small coils of wire suspended
above niodym-magnets; coils rest upon bent wires, and bent wires are connected,
via clip leads, to a battery pack.
Generator (left photo) consists of a small coil of wire suspended
above a niodymium magnet; coil rests upon leads which are connected to a multimeter.

Location

Light LEDs by moving magnet through coil.
LEDs also light when held next to Jumping Ring demo (any fluctuating B field will do).
Fireflies located in L01, section B4. Magnet in section B2.

Purpose: Illustrate principles of electro-magnetic induction.
Send current through solenoid and measure direction of B-field
using B-field indicator (magnaprobe). Place coil of wire in front of solenoid
and quickly adjust current; galvanometer will indicate induced emf consistent
with Lenz’s law.

Location