Category Archives: Physics

Health and Safety at FIRST4MAGNETS!

World Health and safety Day


Today is World Health and Safety Day so we’re giving you a sneak peek into how the employees at First4Magnets.com stay safe each and every day!

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How to create a simple electric train using magnets

Simple electric train made from a battery and magnets inside a copper coil

In this article, we are going to show you how you can create the simplest (possibly), but by far the most awesome (definitely) DIY electric train by using nothing more than  a battery, some bare copper wire and two magnets. Before you stand aghast in disbelief and tell us it can’t be done, make sure you check our article on how to make a basic electric motor with almost identical materials.

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What is a reed switch, and which magnets operate them?

Reed_switch_featured

A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch. The switch effectively works like a gate, or a bridge, in an electric circuit so when the two reeds are in contact, electricity can flow around the circuit operating a device. Unlike mechanical switches they do not require something or someone to physically flick them on or off, they are controlled completely by invisible magnetic fields! Continue reading

What are eddy currents and why do they make a magnet fall slowly through a copper pipe

Neodymium ring magnet on 15mm copper pipe

 

Magnets are fascinating – there are many things about magnets for which the only explanation seems to be magic! The best place to find out about magnet-related phenomena is of course here, on our blog – and YouTube. The most viewed videos showing super-strong magnets falling through copper pipes alone have amassed an incredible 8 million views and counting.

What you are seeing in these videos is of course a demonstration of eddy currents in action. Here we will explain what is going on.

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