All Formulas of Chapter Electricity Class 10 Class 10 Science Electricity Formulas
In this article, we will discuss all formulas of
chapter electricity class 10. Chapter 12 electricity belongs to Physics.
Here you will find all formulas of electricity class 10 NCERT.
All Formulas of Chapter Electricity Class 10 
Numerical questions are asked in the examinations
based on all formulas of electric current class 10. You must learn these all
formulas. You will find examples based on class 10 physics chapter electricity
formulas.
Physical quantity, symbols, and units
Physical
quantity 
Symbol 
Unit (S.I.) 
Electric current 
I 
Ampere (A) 
Charge 
Q 
Coulomb(C ) 
Time 
T 
Second(s) 
Resistance 
R 
Ohm (Ω) 
Potential
difference 
V 
Volt (V) 
Work 
W 
Joule (J) 
Length 
l 
Meter(m) 
Area of crosssection 
A 
Meter square(m^{2}) 
Resistivity/specific
resistance 
P 
Ohm ×meter(Ωm) 
Power 
P 
Watt (W) 
Heat 
H 
Joule (J) 
First, you should note down the formulas and learn
them, after that go through the examples given below.
So after reading the above list of physical
quantities, symbols, and their units, you can easily learn the physics
electricity formulas
All formulas
of Physics Class 10
1.Electric current
`I=frac\{Q}{t}`
`I=frac\{n e}{t}` [Q = ne]
Where n= number of electrons
e= charge on electron = `1.6 ×10^19` Coulomb
2. Potential difference
`V= frac\{W}{Q}`
3. Resistance of a conductor
`R=frac\{V}{I}`
4. Potential difference
V=IR
5. Electric current
`I=frac\{V}{R}`
6. Resistivity or specific resistance
`ρ=frac\{RA}{I}`
7. Total or equivalent resistance
`R=R_1+ R_2+R_3+⋯..R_n`[series combination]
`frac\{1}{R}= frac\{1}{R_1} + frac\{1}{R_2 }+ frac\{1}{R_3} +⋯..1/R_n` [Parallel combination]
8. Power
`P=frac\{W}{t}` [W=VQ]
`P=frac\{VQ}{t}` [`frac\{Q}{t}=I`]
P=VI [V=RI]
`P=I^2 R` [`I=frac\{V}{R}`]
`P=frac\{V^2}{R}`
9. Heat produced
`H=I^2 Rt`
1
So, these are the all formulas of electricity. Before
we start solving numerical questions based on the formula related to
electricity class 10, we will discuss the different components used in an
electric circuit.
Electric Components Symbols Class 10 Science
Chapter 12 Physics Class 10 Numericals
Now we will solve some numericals from electricity
class 10
1. If a 10 C charge is passing through a point in 2 seconds in an
electric circuit. Find the electric current passing through the conductor.
Solution:

Given values
Charge (Q) =10C
Time (t) = 2 s
Electric current (I)=?
`I=frac\{Q}{t}`
`I= frac\{10}{2}`=5 A
2. A current of 1 A
is drawn by a filament of an electric bulb. Find the number of electrons passing
through a crosssection of the filament in 16seconds.
Solution:
Given values
Current (I) = 1A
Time (t)= 16s
The number of electrons (n)=?
`n=frac\{It}{e} = (1 ×16)/(1.6 ×10^(19) )`
`n=10^20`
Solution :
Given values
Charge (Q)= 10C
Voltage (V)= 6v
Work (W)= ?
`V= frac\{W}{Q}`
`6=frac\{W}{10}`
W=10×6=60 J
4.When a conducting wire is connected to 10 volt battery receives 5 amp current, find the resistance of the wire.
Solution :
Given values
Potential difference (V)= 10 volt
Current (I)= 5 amp
Resistance (R) = ?
`R=frac\{V}{I}`
`R=frac{10}{5}`=2 Ω
5.An electric immersion rod draws a current of 5 A when it is connected to 110 V. What current will the heater draw when it is connected to 220V.
Solution:
Given values
Electric current (I)= 5A
Potential difference (V)= 110 V
According to Ohm’s law
V=IR
110=5 ×R
`R=frac\{110}{5}`=22Ω
Now when the voltage is 220 V
220=I ×22
`I= frac\{220}{22}=10 A`
6. Find the specific resistance of wire having a length of 1 m and an area of crosssection 1.20 × 106m2, if the resistance of a wire is 0.015 Ohm.
Solution: 
Given values
Length (L)= 1m
Area of crosssection (A)= 1.20 × 106m2
Resistance ( R)=0.015 Ohm
Specific resistance (P) =?
We know that
`ρ=frac\{RA}{l}`
`ρ=frac\{(0.05× 1.20 ×10^(6) )}{1}=0.06 ×10^(6)`
`ρ=6 ×10^(8)` Ωm
7. Find the total or equivalent resistance of a circuit in which three resistors of 5Ω,10Ω, and 15Ω are connected in a series combination.
Solution: 
Given values
R1= 5Ω
R2= 10Ω
R3= 15Ω
Total resistance (R) =?
We know total resistance in series combination is
R= R1+R2+R3
R= 5 + 10 +15 = 30 Ω
8. Three resistance of 5 Ω, 10 Ω, and 10Ω are connected in parallel combination, find the total resistance of the circuit.
Solution:
Given values
R1= 5Ω
R2= 10Ω
R3= 10 Ω
We know that total resistance in parallel combination
`frac\{1}{R}= frac\{1}{R_1} + frac\{1}{R_2} + frac\{1}{R_3}`
`frac\{1}{R}= frac\{1}{5}+ frac\{1}{10}+frac\{1}{10}`
`frac\{1}{R}= frac\{(2+1+1)}{10}= frac\{4}{10}`
`R= frac\{10}{4}`=2.5Ω
9.A bulb takes 5 A from a 220 V line. Determine the power of the bulb.
Solution:
Given values
Voltage (V)= 220V
Current (I)= 0.5A
Power (P)=?
P=VI
P=220 ×0.5= 110W
10.Two bulbs , one rated 100W at 220V and the second 60W at 220V , which bulb draws high current.
Solution: 
Given values
For the first bulb
P1= 100W
V1= 220V
For the second bulb
P2=60W
V2= 220V
Current drawn by the first bulb
`P_1=V_1 I`
110=220 ×I
`I=110/220`=0.5A
Current drawn by the second bulb
`P_2=V_2 I`
110=220 ×I
`I=frac\{60}{220}`=0.27A
The first bulb draws more current than the second bulb
11.Resistance of filament of bulb is 10 Ω draws electric current 5 A. What is the power of the bulb?
Solution: 
Given
Resistance (R) =10Ω
Current (I)= 5A
Power (P) =?
`P=I^2 R`
`P=5^2×10`=250W
12.1kJ heat is produced each second in 20 Ω resistance. Find the potential difference across the resistor.
Solution: 
Given values
Heat (H)= 1kJ= 1000J
Time (t)= 20 Ω
Potential difference (V)=?
We know
`H=I^2 Rt`
`1000=I^2 × 20 ×1`
`I^2= 1000/20`=50A
`I=√50=7.07 A`
So, the potential difference across the resistor
V=IR
V= 7.07 × 20= 141.40 V
So these are the physics electricity formulas and numerical questions based on these electricity formulas class 10.
Frequently Asked Questions
1. What is electricity formula?
Ans. Chapter 12 Electricity consists of various formulas to find different values like  electric current, potential difference, power, heat, resistance, etc.
2. What are the three formulas for electric current?
Ans. `I=frac\{Q}{t}`
3. Why study chapter 12 electricity class 10 science?
Ans. Chapter 12 is related to Physics class 10 science and it consists of Ohm's law, resistance, power, and other physical values. Numerical questions are asked in the CBSE board exams, so must learn and study this chapter.
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