IV.

International System Units

The International System of Units is a system of units that are practical to use in the laboratory. They are commonly referred to as SI units, from the initials of the French words Système International. The SI unit of electrical current is the ampere (amp), which is defined as 0.1 abamperes. The SI unit of electrical quantity is the coulomb, the amount of electricity passing a given point in a circuit in 1 second when a current of 1 ampere is flowing. The volt (V) is the SI unit of potential difference. It is equal to 100 million abvolts and can be defined as the potential difference existing between two points when 1 joule (10 million ergs) of work is required to move 1 coulomb of electricity from one of the points to the other. The SI unit of electrical work is the watt. It represents the generation or use of electrical energy at the rate of 1 joule per second. The kilowatt is equal to 1000 watts.