History and Discovery of Electricity Electricity is one of our most useful sources of energy today. It is hard to imagine how a modem industrial society could exist without electricity. But until the mid-1800s, no one knew much about electricity or how to use it. Until then, electricity was nothing more than a scientific curiosity. … Read more
Measuring Current measuring current on certain troubleshooting jobsis required. You will need to know how much value of current is flowing in part of a circuit. Measuring the current establishes part of the basis for analyzing the circuit which can lead you to the cause of the problem. To measure the current, you use an … Read more
Electric Current Many materials have free electrons. These electrons are not bound tightly to the atoms. They are free to move from one atom to another. When large numbers of these electrons move in one direction, the result is called an electric current. Electric Current in Metals In metals-for example, copper-the free electrons can move … Read more
Electrical Terms Understanding of electrical terms is compulsory for engineers. As you study electricity in your engineering program, and as you work with electricity in the power plants, industrial plants, you will hear, read, and use various electrical terms. These terms have very exact meanings. You must know what each one means if you are … Read more
Definition of Static Electricity Static electricity is electricity that does not move. The word “static” comes from the Greek word “statikos”, meaning the act of making something stand still. Static electricity consists of electrical charges that remain unmoving on an object. Static electricity is usually generated by the physical contact and separation of different kinds … Read more