The National MagLab is funded by the National Science Foundation and the State of Florida.

# Interactive Tutorials

These demonstrations about laws and tools associated with electricity and magnetism allow you to adjust variables at and to visualize invisible forces — which makes them almost better than the real thing.

## Alternating Current

Every time you plug something into the electricity in your house, you are utilizing the power of alternating current (AC.)

## Arc Lamp

Arc lamps were the first type of electric light, so brilliant the lamps were used for lighthouses and street lights.

## Barkhausen Effect

The Barkhausen effect makes the concept of magnetic domains audible.

## Bullet Speed

This tutorial takes a shot at explaining how circuits can be used to measure things beyond the capacity of human senses.

## Capacitor

A capacitor is similar to a battery, but a few key differences make them crucial additions to many machines.

## Cathode Ray Electromagnetic Deflection Basics

Discover how cathode rays behave in a magnetic field.

## Cathode Ray Tube Television

For decades, the Cathode Ray Tube was used for video displays from televisions to computer screens.

## Compasses in Magnetic Fields

The invention of the magnetic compass radically changed the way humans navigated from place to place. Travelers could orient themselves even when the …

## Contracting Helix

This device demonstrates how parallel wires attract because of the magnetic fields they generate.

## Current Flow

This tutorial illustrates the flow of electricity through a circuit and how that flow is impacted by resistors in the circuit.

## Daniell Cell

English chemist John Frederick Daniell came up with a twist on the simple voltaic cell.

## DC Motor

This simple direct current (DC) motor has been created by pairing a permanent magnet and an electromagnet. The permanent magnet is called a stator bec…

## Deionization

The magnets here at the lab generate massive amounts of heat. To cool them off, we need massive amounts of water. But first, we have to take the ions …

## Diamagnetism and Paramagnetism

Certain metals exhibit a strong response to a magnetic field. But everything reacts to magnetic fields in some way.

## Electricity Meter

The newest electric meters rely on different techniques to measure usage. But power to many homes and businesses is still monitored by traditional met…

## Electromagnetic Induction

When a permanent magnet is moved inside of a copper wire coil, electrical current flows inside of the wire. This important physics phenomenon is calle…

## Electromotive Force in Inductors

Electromotive Force is an important phenomenon that impacts the way electrons flow through a conductor.

## Electrostatic Generator

Though simple by today's standards, the early electrostatic generators were a great milestone in humankind's understanding of electricity.

## Electrostatic Repulsion from Van de Graaff Generator

A fun way to illustrate electrostatic forces from a Van de Graaff generator.

Just a year after electromagnetism was discovered, the great scientist Michael Faraday figured out how to turn it into motion.

Out of a humble ice pail the great experimentalist Michael Faraday created a device to demonstrate key principles of attraction, repulsion and electro…

## Foucault's Disk

In 1855, a French physicist created a device that illustrated how eddy currents work.

## Galvanometer

A galvanometer detects and measures small amounts of current in an electrical circuit.

## Guitar Pickup

This simple device transforms the mechanical energy of the vibrating guitar strings into electrical energy.

## Hall Effect

When a magnetic field is applied to a flowing current, it creates a weak but measurable voltage. This is the Hall effect.

## Heat Resistance

Metals conduct electricity because their atoms have free electrons that can move between them. As those free electrons move through the metal conducto…

## Inductive Pendulum

Get the swing of electromagnetic induction with this device.

## Inductive Reactance

Like resistance, reactance slows down an electrical current. This phenomenon occurs only in AC circuits.

## Kelvin Water Dropper

The legendary Lord Kelvin made electricity from water with his water dropper.

## Lodge's Experiment

Sir Oliver Lodge's experiment demonstrating the first tunable radio receiver was an important stepping stone on the path toward the invention of a pra…

## Lorentz Force

A wire fashioned into a pendulum moves inside a magnetic field, demonstrating the Lorentz force.

## Magnetic Core Memory

Magnetic core memory was developed in the late 1940s and 1950s, and remained the primary way in which early computers read, wrote and stored data unti…

## Magnetic Domains

Why can some materials be turned into magnets? It’s all thanks to magnetic domains.

## Magnetic Field Around a Wire

Whenever current travels through a conductor, a magnetic field is generated.

## Magnetic Field of a Solenoid

You can create a stronger, more concentrated magnetic field by taking wire and forming it into a coil called a solenoid.

## Magnetic Resonance Imaging (MRI)

Magnetic Resonance Imaging machines, commonly known as MRIs, are awesome diagnostic tools for medical applications and research. Relying on strong sup…

## Magnetic Shunt

Magnetic shunts are often used to adjust the amount of flux in the magnetic circuits found in most electrical motors.

## Mass Spectra

Mass spectrum reveals how many isotopes of a given element are to be found in a material.

## Mass Spectrometer (Dual Sector)

Mass spectrometers are instruments that give scientists insight into the composition of complex materials. These spectrometers can analyze materials a…

## Mass Spectrometer (Single Sector)

Mass spectrometers are instruments that give scientists information on the composition of a material. Mass spectrometers can pick apart complex substa…

## Microwaves

How does a microwave heat your food? Water interacting with high-frequency electromagnetic waves.

## Ørsted's Compass

In 1820, Hans Christian Ørsted discovered the relationship between electricity and magnetism in this very simple experiment.

## Parallel Wires

A pair of parallel wires serves to illustrate a principle that French scientist André-Marie Ampère was the first to comprehend.

## Pixii Machine

This “magneto-electric machine” was the first to turn motion into electricity.

## Simple Electrical Cell

The simple electrical cell explained here is the most basic type of "wet" cell and demonstrates the fundamental chemistry behind batteries.

## Tape Recorder

Two heads — or even three — are better than one when it comes to understanding how tape recorders harness electromagnetic induction.

## Transformers

Transformers are devices that transfer a voltage from one circuit to another circuit via induction.

## Transmission Lines

Electricity goes through some ups and downs on its way from the power plant to your house. Here's how it works.

## Van de Graaff Generator

The Van de Graaff generator is a popular tool for teaching the principles of electrostatics. You might remember it as the thing that made your hair st…

## Voltaic Pile

Italian scientist Alessandro Volta was the first to recognize key principles of electrochemistry, and applied those principles to the creation of the …

## Wheatstone Bridge

This circuit is most commonly used to determine the value of an unknown resistance to an electrical current.