it is presence or flow of charge is called electricity.


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 =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 )


it is flow of charge per unit time.

Current =Charge/Time


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


it use to measure electric current in a circuit .

it has low resistance.

it always connected in series in a circuit.

Electricity. Using ammeter.
Electricity circuit



it is measure voltage in electrical circuit.

it has high resistance.

it always connected in parallel of circuit.

Electricity... voltmeter

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.

Electricity circuit components
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

Electricity.   Ohm's law
Ohm’s law

3d substitution

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