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DoodleScience
Electromagnets and Electromagnetic Induction _ GCSE Physics
When a current flows through a wire it causes a magnetic field to be produced around the wire. For a single piece of wire, the magnetic field is made up of concentric circles around the centre. If you coil the wire up however, the...
Khan Academy
Khan Academy: Electricity and Magnetism: Circuits (Part 2)
A discussion of how resistors work in a series. [11:07]