Get Your Science On: Photon of the Opera – submitted by Joanne O’Meara

What’s Going On?

When a magnet is moved by a coil of wires, you can induce an electric current. This is the principle behind how most of the electricity is produced in the world; it’s just a question of where you get the energy to move the magnets. Every time a magnet passes the coil, a small amount of electricity is created, which makes the LED lights briefly flash on. Continue reading

Internal Resistance and Dry Cells

batteries

Every dry cell can be considered as being made up of two parts. Internal Resistance cannot be separated from the cell because coulombs need energy to move through any real material (including cells). Coulombs need very little energy to move through conductors. When coulombs move through loads they need (or convert to other forms or lose) more energy. The more coulombs that move through something the more energy that is converted to other forms. Another way of saying this is; the more current flowing through something the more energy is lost.

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How much does a falling magnet weigh?

Armed with a large neodymium magnet, an aluminium tube and a set of scales, Andy explores the interaction of forces generated as the magnet falls and the effect these forces have on the objects’ weight.

Explore more Tales from the Prep Room and let us know in the comments below which experiment you would like to see from us next: http://richannel.org/collections/2011…

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