Notes of Electricity

ELECTRICITY

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Short notes:

* Electric current and circuit

* Electric potential and potential difference

* Circuit Diagram

* Ohm's Law

*Combination of Resistance

* Series combination of resistance

* parallel combination of resistance

* Heating Effect of electric current

* Electric power

1) Electric current and circuit:

I= Q/t

where I= electric current

Q= charge

t= time

S.I unit of , I= ampere

Q= coulomb

t= sec

2)Electric potential and potential difference :

V= W/ Q

where V = potential difference

w= work

Q= charge

S.I unit of V= volt

w= joule

Q= coulomb

3) Circuit Diagram:

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4) Ohm's Law :

V= IR

=> R= V/I

=>I= V/R

where V = potential difference

R= Resistance

I= Electric current

S.I unit of R= ohm

5) Combination of Resistance : It is of two types ,

i.e i) Series combination of resistance

ii) parallel combination of resistance

i) Series combination of resistance:

R= R1+R2+R3+R4---------+Rn

ii) parallel combination of resistance

1/R=1/ R1 + 1/R2 + 1/ R3 + -------- + 1/Rn

6) Heating Effect of electric current :

P= VI

where I= Q/t

P= VQ/ t

=> H= VIt

where H = heat

7) Electric power :

P= VI

where p = power

S.I of p= watt

notes:

1kw= 1000w

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