The flow of electricity is not a new thing; people have been using electricity since the ancient Greek discovery of static electricity and charge. One the other hand, we know exactly when the light bulb was discovered. In 1802, incandescent light was made for the first time with several thousand batteries and a strip of platinum. Edison patented the light bulb in 1872 using a carbon filament instead of a metal.
Electric current can be detected in a number of ways without a bulb. One of the most obvious is when large charges interact to make an arc. These are very bright and loud, and indicate high charge. Another way is through an ammeter or amperemeter, which uses magnetic field to detect and measure current flow. Finally, the pain of touching a live wire could be used.
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