Video narration
How can motion make electricity? A hand-crank torch lights when turning changes the magnetic field. Connect a coil and galvanometer; move a magnet through it. Hold it still: no deflection. Move it in or out: deflection, showing induced emf. Key: electromagnetic induction occurs when magnetic flux through the coil changes. Move faster: faster flux change, larger emf. Faraday's law says, E equals minus delta phi over delta t. No change means no induced emf.