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According to a controversial theory, the Parthians may have had knowledge of electroplating, based on the 1936 discovery of the Baghdad Battery, which resembles a galvanic cell, though it is uncertain whether the artifact was electrical in nature.Benjamin Franklin conducted extensive research on electricity in the 18th century, as documented by Joseph Priestley (1767) History and Present Status of Electricity, with whom Franklin carried on extended correspondence.In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily.In 1905, Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets, energising electrons. Einstein was awarded the Nobel Prize in Physics in 1921 for "his discovery of the law of the photoelectric effect".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.Thales was incorrect in believing the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity.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.
In a solid-state component, the current is confined to solid elements and compounds engineered specifically to switch and amplify it.Ancient Egyptian texts dating from 2750 BCE referred to these fish as the "Thunderer of the Nile", and described them as the "protectors" of all other fish.Electric fish were again reported millennia later by ancient Greek, Roman and Arabic naturalists and physicians.The presence of an electric charge, which can be either positive or negative, produces an electric field.The movement of electric charges is an electric current and produces a magnetic field.
Thus, if that charge were to move, the electric field would be doing work on the electric charge.