Voltage is represented in equations and schematics by the letter âVâ. When describing voltage, current, and resistance, a common analogy is a water tank. In this analogy, charge is represented by the water amount, voltage is represented by the water pressure, and current is represented by the water flow.
In the 17th century, 'muggle' was an informal synonym of 'sweetheart'. The Harry Potter world is divided into the magical and the mundane, and J.K. Rowling created an entire vocabulary to separate the wizarding world from the Muggle world. Among those words was Muggle. A Muggle is a non-magical person.
Today, however, crucial words used to describe these traditional topics have been stripped from an influential children's dictionary in favour of more 'modern' terms. Among the entries which have disappeared from the latest edition of the Oxford Junior Dictionary are disciple, coronation, empire, piglet and acorn. In their place come the likes of MP3 player, broadband, biodegradable, committee and celebrity.