## Electricity

it is presence or flow of charge is called electricity.

## Charge

It is the property of atom.It maybe positive(+ve) or negative(-ve).Like charges replace each other and unlike charges attract each other. Charge SI unit Coulomb (S).

Charge on one electron (e=1.6×10^-¹⁹s)

Number of electrons in one coulomb of charge n=6.25×10¹⁸

Q=ne

Q =Charge

n =Number of electrons

e =Charge on one electron

Q=ne , n=Q/e , n=1/1.6×10^-¹⁹ =6.25×10¹⁸

## Types of electricity

1- Static electricity

• Fixed charge (no movement one to another end)

2- Current electricity

• Charge in not fixed (Charge move in specific directions )

## Current

it is flow of charge per unit time.

Current =Charge/Time

I=Q/t

• SI unit of current is Ampere (A).
• Current is measured by Ammeter.

## Ammeter

it use to measure electric current in a circuit .

it has low resistance.

it always connected in series in a circuit.

## Voltmeter

it is measure voltage in electrical circuit.

it has high resistance.

it always connected in parallel of circuit.

## Electric circuit

The electric circuit are closed loop or path which from a network electric components. Were electrons are able to flow.

The path is made by electric wires and powered by a electric source like a battery. The start of the point from where the electrons start flowing is called the source.

The point where electrons leave the electrical circuit is called the return. Electric wires generally made by copper.

When the circuit key is close is called close circuit. When circuit key is open then it called open circuit.

## Circuit diagram

A circuit diagram is a graphical representation of an electrical circuit in which different electrical components of the circuit are presented by their symbols.

Symbols of some commonly used components in circuit diagram.

## Ohm’s law

Ohm’s law starts that the potential (v) difference across two points of metallic conductor is directly proportional to current (I) passing through the circuit .

Provided it’s temperature and other physical conditions remains constant.

So according to ohm’s law

v is directly proportional to I

v= IR

you may like it

if you want to buy anything about electrical just click

##### You May Also Like ## Electric Circuits, Basics of the voltage and current laws

Suppose we take our circuit of a battery and a light bulb,and we make it slightly more complicated… ## OHM’S Law Explained – The basics circuit theory

We’re going to be looking at Ohm’s Law to understand how it works as well as how to use… ## How to use Digital Clump meter

Hello, today I’d like to show you how to use a clamp meter measure ac current. We will… ## How to make a Automatic Transformer AC

Part 1 I will be showing you how to make an automatic Transformer. Switch from a double pole double really.Now this…  