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The photoelectric effect is also employed in photocells such as can be found in solar panels and this is frequently used to make electricity commercially.The first solid-state device was the "cat's-whisker detector" first used in the 1900s in radio receivers.Electrical power is now the backbone of modern industrial society.Long before any knowledge of electricity existed, people were aware of shocks from electric fish.Thales of Miletus made a series of observations on static electricity around 600 BCE, from which he believed that friction rendered amber magnetic, in contrast to minerals such as magnetite, which needed no rubbing.

The movement of electric charges is an electric current and produces a magnetic field.Several ancient writers, such as Pliny the Elder and Scribonius Largus, attested to the numbing effect of electric shocks delivered by electric catfish and electric rays, and knew that such shocks could travel along conducting objects.Possibly the earliest and nearest approach to the discovery of the identity of lightning, and electricity from any other source, is to be attributed to the Arabs, who before the 15th century had the Arabic word for lightning ra‘ad ( Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber, could be rubbed with cat's fur to attract light objects like feathers.Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge.In early days, electricity was considered as being unrelated to magnetism.

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