Science glossary film: Alternating current

An electric current in which the flow of electric charge periodically changes direction. Mains electricity is an alternating current with a frequency of either 50 or 60 hertz. This means that the current changes direction 50 or 60 times every second. Slowing down film of a fluorescent bulb allows us to see a flicker, caused by the alternating current repeatedly changing direction. Electrical power is distributed as alternating current because its voltage may be increased or decreased by a transformer. This means that electricity can be generated by remote power stations, and then carried over great distances at a high voltage, using distribution networks called grids. The electricity can then be transformed to a lower, safer voltage, for use in businesses, public places, and homes.

Mains electricity is an alternating current with a frequency of either 50 or 60 hertz. This means that the current changes direction 50 or 60 times every second. Slowing down film of a fluorescent bulb allows us to see a flicker, caused by the alternating current repeatedly changing direction. Electrical power is distributed as alternating current because its voltage may be increased or decreased by a transformer. This means that electricity can be generated by remote power stations, and then carried over great distances at a high voltage, using distribution networks called grids. The electricity can then be transformed to a lower, safer voltage, for use in businesses, public places, and homes.