The venomous Red-Bellied Black Snake grows to lengths of up to two metres long, and has striking colouration. With stunning red edges to its belly scales and a shiny black back, this snake surely ranks amongst Australia's most stunning venomous snakes.
For other uses, see EMF (disambiguation). Electromotive force, also called emf (denoted E {\displaystyle {\mathcal {E}}} and measured in volts), is the voltage developed by any source of electrical energy such as a battery or dynamo. It is generally defined as the electrical potential for a source in a circuit.
Technically a battery has a certain number of joules of energy available but no one specifies them that way. What is usually specified is the ampere-hour capaciity. Ampere-hour capacity is the product of the current drawn from the battery and the time (in hours) over which that current is drawn. It is important to know the specific load the battery is experiencing when these numbers are being determined.