👉 In electronics, a henry is a unit of measurement used to measure current. It's named after American inventor Henry Cavendish, who first proposed it in 1793. The unit is defined as the ratio of the current flowing through a conductor to its resistance. For example, if a circuit contains a wire with a resistance of 20 ohms and flows a current of 5 amperes, then the henry would be calculated as: \[ \text{