Electric current
From Tardis Wiki, the free Doctor Who reference
Electric current, also known as electrical current or just current, was a measure of charge transfer. It could be measured in kiloamperes. (TV: Last of the Time Lords)
According to Laurence Scarman, electric current could be "highly dangerous". (TV: Pyramids of Mars)
Alternating current and direct current were types of electric current. Nikola Tesla's Wardenclyffe laboratory was designed to send electric current through the earth and into the air. (TV: Nikola Tesla's Night of Terror)