Work<span> done is generally referred in </span>relation<span> to the force applied while energy is used in reference to other factors such as heat. </span>Power<span> is defined as </span>work<span> done per unit time. Or energy per unit time. Eg: if you supply 50 joules over a period of 5 seconds, you have supplied 50/5=10 Watts of </span>power<span>.</span>
A lodestone is a naturally magnetized piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron. The property of magnetism was first discovered in antiquity through lodestones.
