Question

equations for electricity for class 10

Answer 1

All formulas of class 10 electricity chap .....
1) q = +ne
where ,
q = total no.of charges
n = no.of electrons
e = charge of electron

2) V = W / Q
where ,
V = electric potential
W = workdone
Q = charge

3) potential difference = Va - Vb
= W/Q
= W / I× T

4) I = Q × T
where,
I = electric current
Q = charge
T = time

*I = ne / T ( Q = ne )

5) V = IR
where ,
R = resistence

6) P = RA / l
where ,
P = resistivity
A = area of cross section

7) V = V1 + V2 + V3
V1 = IR1
V2 = IR2
V3 = IR3
=> V = IR1 + IR2 + IR3
=> V = I ( R1 + R2 + R3 )
If , V = IRs
=> IRs = I ( R1 + R2 + R3 )
=> Rs = R1 + R2 + R3

8) I = I1 + I2 + I3
ACCOR.TO OHMS LAW,
I = V / R
I1 = V / R1
I2 = V / R2
I3 = V / R3
I = V/R1 + V/R2 + V / R3
I = V ( 1/R1 + 1/R2 + 1/ R3 )
If, Rp = effective resistence
=> I = V/ Rp
V/ Rp = V ( R1 + R2 + R3 )
=>1/Rp = 1/R1 + 1/R2 + 1/R3 ......+ 1/ Rn

9) H = VIT = I^2RT = V^2 T / R
where ,
H= heat

10) E = VIT
where ,
E = electric energy

11) P = W/T
where , P = power
now , putting W = VIT
P = VIT / T
P = VI

hope it helps u mate...
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Answer 2

HELLO GUYS SO,
1. CURRENT I I=Q/t here Q is charge. t is time taken . unit is amperes
2. VOLTAGE V V=E/Q . Unit is volts
3. RESISTANCE R. R=pL/A . Unit is ohm
4. " R. R=V/I. Unit is ohm
5. POWER P. P=VI. Unit is watts
6. conductivity. sigma=I/P. Unit is siemens per meter

THANKS YOU