Learn About Resistance

From Ohm's law -
V/I = R 
V= IR
I = V/R

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RESISTANCE CONNECTIONS

1. SERIES CONNECTION

2. PARALLEL CONNECTION

SERIES CONNECTION-

From the upper diagram-

Here current I is same across all the resistances. 

We know,

V = V1+V2+V3

IR = IR1 + IR2 + IR3 [from Ohm's law]

So, R = R1+ R2 +R3

PARALLEL CONNECTION-

From upper diagram-

Here V is same across all resistance,

We know,

I = I1 + I2 + I3

V/R = V/R1 + V/R2 + V/R3 [from Ohm's law]

So, 1/R = 1/R1 + 1/R2 + 1/R3

1/R = (R2R3 + R1R3 + R1R2)/(R1R2R3)

R = (R1R2R3)/(R2R3 + R1R3 + R1R2)

So, G = G1 + G2 + G3

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BASIC OF CURRENT VOLTAGE ELECTRICITY

ATOM = ELECTRON + PROTON + NEUTRON

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Electron  = -1.602x10^-19

Neutron  = NIL

Proton    = +1.602x10⁺¹⁹ 

IONS = Positive and Negative 

Current-(I)  Controlled the movement of electron through a substance is called Current.
Direction of the flowing current is opposite direction of the flowing electron.

Electromotive Force-(EMF) EMF is the force that causes a current (I) of electricity to flow.
Total voltage in a electric circuit generate by the sources or battery.
It is applicable for electric field.

Potential Difference-(V) Work done per unit charge to more charge between the -ve and +ve terminal of the battery.
Potential Difference between 2 points in a circuit is electrical pressure or voltage required to drive the current between them.

It is applicable for magnetic, gravitational and electric field.

Resistance-(R) Opposition of flow of electron as well as the opposition of flow of current.

ρ = nature of material
l = length
A = cross section area
R = Resistance

Conductance-(G)

Conductivity-(σ)

OHM's Low-   For a fixed metal conductor, the temperature and other condition remaining constant the current (I) through it is proportional to the potential difference (V) between its end.

Relation between power, voltage and current-

P = Power

V = Voltage

I = current

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