Arguably, the machine that has most eased the burden of work for humans is the electric motor – a device that transforms electricity into motion. You can find these at the heart of every washing ...

Equipment: A motor made from a battery, a magnet, 2 paper clips a rubber band and some insulated copper wire that has been wound into a loop. What it does: When assembled, the coil rotates freely ...

You can increase the strength of this magnetic field by increasing the current or by making multiple loops. Since we want a simple motor, more loops is the way to go. How many? It doesn't really ...