Basic of Electricity: Learn About Resistance

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

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

Basic of Electricity