Current Electricity Definition Physics

Current electricity class 12 notes chapter 3 1.

Current electricity definition physics. The variables which cause and hinder the rate of charge flow are explained and the mathematical application of electrical principles to series parallel and combination circuits is presented. A common unit of electric current is the ampere which is defined as a flow of one coulomb of charge per second or 6 2 10 18 electrons per second. We know that electric current is the result of the flow of electrons. Commercial power lines make available about 100 amps to a typical home.

If the two requirements of an electric circuit are met then charge will flow through the external circuit. Using the word current in this context is to simply use it to say that something is happening in the wires charge is moving. Current is the rate of flow of electric charge. The adjective electric is implied by the context of the situation being described.

However in circuit analysis the direction of current is relevant. It is said that there is a current a flow of charge. An electric current is the rate of flow of electric charge past a point. The si unit of electrical current is the ampere defined as 1 coulomb second.

If q charge flows in time t then current at any time t is note. Direct current dc direct current is the constant flow of electric charge in one direction. The centimetre gram second units of current is the electrostatic unit of charge esu per second. I is in the direction of flow of.

Therefore it is important to know what is current and the properties of the electric current. The directed rate of flow of electric charge through any cross section of a conductor is known as electric current. A potential difference voltage across an electrical component is needed to make a current flow through it. One ampere equals 3 10 9 esu per second.

Despite referring to many different things the word current is often used by itself instead of the longer more formal electric current. The flow of charge through electric circuits is discussed in detail. Electric current is an important quantity in electronic circuits. Electric current is defined as the rate at which charge flows through a surface the cross section of a wire for example.

Batteries generate direct current to power handheld items. We have adapted electricity in our lives so much that it becomes impossible to imagine life without it. 614 an electric current is said to exist when there is a net flow of electric charge through a region. A 60 watt lightbulb pulls.

Units and notation for electrical current. Current is a scalar quantity. Most electronics use direct current for internal power often converting alternating current ac to direct current dc using a transformer.