Question

short note about electricity lesson​

Answer 1

Hey Ma8,

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Q = charge

I = current

V = Pottential difference or voltage

P = power

R = resistence

W = work

T = time

the value of electric charge is 1.6 × 10 ^ -19

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I = Q ÷ T

the SI Unit of current is Amp

the rate of unit charge is called current

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V = W ÷ Q

work Done to move a unit Charge is called Pottential difference

pottential difference is also called as voltage

the SI Unit of pottential difference is volt

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V Proportional I = ohm's law

ohm's law state that the Pottential difference in a electric conductor is directly proportional to the current which is flow through this

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which resist current is called as resistence

the SI unit of resistence is ohm

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factors on which the resistence of a conductor depend

1 = length of the conductor

2 = Area of cross Section of the conductor

3 = Temperature

4 = nature of the material

R = resistivity × length ÷ area of the conductor

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heating effect of electric current or joule's law :-.

the total ammount of heat produced in the conductor is directly proportional to the

1 = Square of the current

2 = resistence of the conductor

3 = time in which current flows

H = I^2 × R × T

the SI unit of heat is joule

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P = the rate of electric work is called as power

or

the Product of pottential difference and current

P = W ÷ T

P= VI

P = I^2R

P = V^2 ÷ R

the SI unit of power is watt

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resistivity = the resistence of a conductor which have 1 meter length and 1 meter area

SI unit of resistivity is ohm meter

=> the symbol of resistivity and it's Formula given in attachment <=

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the formula of series and parallel resistor

for series resistor

=> R = R1 + R2...

for // resistor

=> 1 ÷ R = 1÷ R1 + 1 ÷ R2...

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=> figure of series and parallel resistors given in 10th ncert book page number 210 <=

derivation of series and parallel resistor :-

for series

V = ?

V = V1 + V2 + V3

according to the ohm's law

IR = IR1 + IR2 + IR3

R = R1 + R2 + R3

for // resistor

I = ?

I = I1 + I2 + I3

according to the ohm's law

V÷R = V ÷ R1 + V ÷ R2 + V ÷ R3

1 ÷ R = 1÷R + 1÷R + 1÷R

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