# Electromagnetic Induction

## K2-65: INDUCTION AND CAPACITOR FLASHLIGHT

Purpose: Demonstrate a weird but high-tech method for constructing a flashlight.

## K2-64: UNIPOLAR GENERATOR

Purpose: Demonstrate unipolar generation of DC voltage, which may involve an explanation other than electromagnetic induction.

## K2-49: MAGNETIC STIRRER

Purpose: Illustrate how a magnetic stirrer works.

## K2-48: EDDY CURRENT MOTOR`

Purpose: Show the use of eddy currents in producing a motor with few moving parts and no electrical brushes.

## K2-47: SPEEDOMETER MODEL

Purpose: Demonstrate operating principle of some speedometers.

## K2-46: MAGNET LEVITATION ABOVE SPINNING DISC

Purpose: Demonstrate Lenz's law in a dramatic way.

## K2-45: EDDY CURRENTS - MAGNET AND SOFT DRINK CAN

Purpose: Demonstrate eddy currents and Lenz's law.

## K2-29: COIL AND MAGNET WITH LED SENSOR

Purpose: Demonstrate that the sign of the induced voltage depends on the direction of the field as well as whether the field is increasing or decreasing in magnitude.

## K2-28: DEMOUNTABLE TRANSFORMER - 10 KV ARC

Purpose: Demonstrate that a large voltage increase is attainable using a transformer.

## K2-21: RUHMKORFF INDUCTION COIL

Purpose: Demonstrate induction of a very high voltage using a small voltage source.

## K2-05: FARADAY'S EXPERIMENT - CONCENTRIC COILS

Purpose: Demonstrate mutual induction.

## J7-24: BARKHAUSEN EFFECT

Purpose: Demonstrate flipping of magnetic domains in iron.

## J6-33: ELECTROMAGNETIC GUN

Category: J6 Electromagnets
Purpose: Demonstrate the force on a solenoid core, and to contrast forces on magnetic and non-magnetic cores.

## J6-32: FORCE ON SOLENOID CORE - SMALL

Category: J6 Electromagnets
Purpose: Demonstrate the force exerted on the core of an electromagnet.

## J6-31: FORCE ON SOLENOID CORE

Category: J6 Electromagnets
Purpose: Demonstrate the force exerted on the core of an electromagnet.

## J2-33: TESLA COIL - PORTABLE

Purpose: Easy-to-use high-voltage device for use in various demonstrations or just to draw a nice spark.

## K1-41: BARLOW'S DISC

Purpose: Demonstrate how an electric potential difference and current can be generated when free (conduction) electrons move through a magnetic field.

## E2-11: SOLAR PLASMA MODEL

Category: E2 Astronomy
Purpose: Mass driver and ring heater show coronal holes and coronal heating.

## K2-63: DISPLACEMENT CURRENT MODEL

Purpose: Illustrate the geometry for displacement current

## K2-41: LENZ'S LAW - ROLLING RODS

Purpose: Demonstrate eddy currents and Lenz's law
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• #### K7-01: RL CIRCUIT - 50 MICROSECOND TIME CONSTANT

Illustrate RL time constant Read More
• #### K7-02 RL CIRCUIT - L/R TIME CONSTANT

Shows L/R time constant for a slow circuit Read More
• #### K7-03 INDUCTOR DELAYING A LAMP

Demonstrates the timing of current in a switched inductor circuit Read More
• #### K7-04: RL CIRCUIT - FIELD COLLAPSE WITH FLUORESCENT BULB

Demonstrate the magnitude of induced voltage Read More

• #### K7-11 RC CIRCUIT - RC TIME CONSTANT - OSCILLOSCOPE

Observe the shape of the charging and discharging curves. Measures an RC time constant. Read More
• #### K7-12: RC CIRCUIT - RC TIME CONSTANT - PROJECTION METERS

Measure an RC time constant and to observe the shape of the charging and discharging curves Read More
• #### K7-14: RC CIRCUIT - 100 MICROSECOND TIME CONSTANT

Demonstrate a reasonably fast RC circuit Read More
• #### K7-15: CURRENT IN RC CIRCUIT?

Demonstrate charging of a capacitor in a possibly counterintuitive way Read More
• #### K7-21: RLC CIRCUIT - 10 KHZ - RESONANCE

Demonstrate resonance in an RLC circuit Read More
• #### K7-22: RLC CIRCUIT - 10 KHZ - DAMPED OSCILLATIONS

Demonstrate damped oscillations in an RLC circuit Read More
• #### K7-23: RLC CIRCUIT - 60 HZ

Show phase relationship between components of a 60 Hertz RLC circuit Read More
• #### K7-24: RLC CIRCUIT - 60 HZ WITH LIGHT BULB LOAD

Demonstrate a series RLC circuit in a graphic way Read More
• #### K7-26: RLC CIRCUIT - 0.3 HZ RESONANCE

Plot a graph of resonance behavior in a very low frequency resonant circuit Read More
• #### K7-27: RLC CIRCUIT - COMPLETE

Show the phase shift between components in a series RLC circuit Read More
• #### K7-29: RLC CIRCUIT - 0.6 HZ TRANSIENTS

Demonstrate transients using a circuit with a very long time constant Read More
• #### K7-30: RLC CIRCUIT - RINGING

Demonstrate ringing in a simple RLC circuit Read More
• #### K7-31: RLC CIRCUIT - OVER/UNDER/CRITICAL DAMPING

Demonstrate over/under/critical damping in a series RLC circuit Read More
• #### K7-41: RC CIRCUIT - DIFFERENTIATION AND INTEGRATION

Demonstrate differentiation and integration using RC circuits Read More