Question

I want all the formulas used in the chapter Electricity of class grade 10. CBSE..

Answer 1

KEY :
Charge = Q
current = I
resistance = R
potential difference= V
terminal voltage = V
voltage drop = v
internal resistance = r
electro motive force = e
time = t
work = W
heat energy = H
power = P
Energy= E
Re = equivalent resistance

FORMULAS
1) Q=It
2) V=IR
3) v=Ir
4) Q = no. of electrons × charge of an electron
5) e = I( R+r)
6) e= V+v
7) W = QV
8) W= VIt
9) W= I^2 Rt
10) I = P/V
11) P= W/t
12) P= QV/t
13) P = I^2R
14) P = V^2 / R
15) H = I^2Rt
16) E= Pt
17) Re for series= R1+R2+R3.......
18) Re for parallel = 1/ R1 + 1/ R2 + 1/ R3......




HOPE THIS HELPED U !!!!!

Answer 2

Electricity :

● V ∝ i, when the sign of proportionality is removed then,

⇒ V/i = R where V = Potential Difference, i = Electric Current, and R = Resistance.

● Here, V = Workdone/Charge or W/Q

● Here, i = Charge/time or Q/t

● R ∝ l/A and when sign of proportionality is removed then,

⇒R = þ l/A where þ = rho (resistivity), l = length and A = cross section area.

● In series combination, R = R₁ + R₂ (current remains same)

In parallel combination, 1/R = 1/R₁+ 1/R₂ (voltage or potential difference remains same)

● Power = Voltage × current, P = Vi

Or P = i²R and P = V²/R

● Heat = Power × time or H = Vit

⇒ H = V²t/R or i²Rt