In this post, you will get Notes of Electricity Class 10. Notes will help you to revise full chapter in short. 


Electricity - Notes

Electric Charge denoted by  (Q) 
SI unit of electric charge is Coulomb. 
Coulomb denoted by   (C). 
Proton possesses Positive Charge :-
Electron possesses Negative Charge :-

Potential denoted by (V) 
Unit of Potential :- Volts
Potential Difference= Work done/Quantity of charge moved
V =Volts
W = Work Done
Q = Quality of charged moved

SI unit of Work done :- Joule 
Joule denoted by (J) 


Potential difference is measured by - Voltmeter. 
Voltmeter is always connected (In Parallel) 
Voltmeter has (High Resistance ) 
Other name of potential difference (Voltage)

Electric Current 
[{(Rate of flow of charge)}]

The electric current is the flow of electric charge (called electron) in a conductor such as metal wire.

SI unit of electric current :- Ampere
Ampere denoted by (A) 
Current is measured by (Ammeter) 
Ammeter is connected in (series) 
Ammeter should very have low resistance. 

Ohm's Law


I = Current   [SI unit = Ampere]
R = Resistance   [SI unit = ohm]
V = Potential difference    [SI unit = volts]


Resistivity 

Unit of resistivity


SI unit of Resistivity (ohm-metre) 
Combination of Resistence (or Resistor) 
The resistance can be connected in two ways:
a) in series
b) in parallel

When two or more resistances are connected end to end consecutively, they are said to be connected in series. 

When two or more resistances are connected between the same two point, they are said to be connected in parallel. 

Resistance Or Resistors in Series
According to the law of combination of resistances in series:
"The combined resistance of any number of resistance connected in series is equal to the sum of the sum of the individual resistances".


Resistances Or Resistors in Parallel 
According to the law of combination of resistances in parallel: 
" The reciprocal of the combined resistance of a number of resistance connected in parallel is equal to the sum of the reciprocals of all the individual resistances. 

Electric Power
Electric Power : (work done per unit time) 
Unit of Power (Joule per second) 
SI unit of electric power (watt) 
Watt is denoted by (W) 

     1 kilowatt = 1000 Watts
Or          1KW = 1000 W

Formula for Calculating Electric Power

[Electric power = Voltage x current]
P = V x I Watts

Some other formula for calculating Electric Power

Electrical energy = Power x Time
E = P x t

Heating effect of Current