Daisy Dyno demonstrates the motor effect. When an electric current passes through a magnetic field, there is a force on the charges that make up the current. If the charges are trapped in a conductor, as is almost always the case, there is a force exerted on the conductor. Daisy Dyno makes this clear by allowing the user to touch a wire to a flat segmented disk-like rotor. When the rotor is touched by the wire, a current flows, often creating a small spark, and the wire itself moves as the disk begins to spin. All of this happens because the disk is located in a strong magnetic field.