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 ...

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 ...

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 ...