
What is Resistor?
Resistor itself says resist, an electrical component that resist or limits the flow of electric current. For more information about resistor read our blog What is Resistor?
Ohm’s Law
Ohm’s law states that voltage across the ends of a conductor is directly proportional to the current flowing to the conductor where all physical conditions (Like Temperatures, Humidity, Pressure, etc) remain constant.V ∝ I
If we write in equation then,V = IR or I = V/R
Where R is the resistance of a conductor. For more information about Ohm’s law read our blog Ohm’s Law.
Calculate total Current Using Ohm’s Law
In circuits where resistances are in parallel, the voltage across the each resistor is same but current is divided among it. If two resistors are connected(Fig 1) in parallel then,ITotal = I1 + I2
If three resistor are connected(Fig 2) in parallel then,ITotal = I1 + I2 + I3
If n no. of resistors are connected(Fig 3) in parallel then,ITotal = I1 + I2 + I3 + …. + In
Now, we can write I1 as V/R1, I2 as V/R2 and so on upto nth resistors according Ohm’s LawITotal = V/R1 + V/R2 + V/R3 + …. + V/Rn
Parallel Resistance Formula
As we know that V=IR and if we have n no of resistors and total current in that circuit is ITotal then the equivalent resistance is :Req = V / ITotal
Now put the value of ITotalReq = V / (V/R1 + V/R2 + V/R3 + …. + V/Rn)
By simplifying we get :Req = 1 / (1/R1 + 1/R2 + 1/R3 + …. + 1/Rn)

1 / Req = 1/R1 + 1/R2 + 1/R3 + …. + 1/Rn
How to calculate the Equivalent Resistance
If two resistors are connected (Fig 1) in parallel then, equivalent resistance is :1 / Req = 1/R1 + 1/R2
We can expressed as :Req = (R1 * R2) / (R1 + R2)
If three resistors are connected (Fig 2) in parallel then, equivalent resistance is :1 / Req = 1/R1 + 1/R2 + 1/R3
We can expressed as :Req = (R1*R2*R3) / ((R1*R2)+(R2*R3)+(R3*R1))
Do you want to support our videos ?
https://www.buymeacoffee.com/ratnasrobolab
Support Our Channel By Shopping parts from Amazon !
Video Components
1. My Camera : https://amzn.to/3L9Nzyb
2. Camera Stand Tripod : https://amzn.to/3Lwo1gd
3. T Bulb : https://amzn.to/3AtLk43
4. Boya Mic : https://amzn.to/3HbTrGc
5. Wall mount stand for Camera and other Mounting Accessories : https://amzn.to/41GLTTR
6. Overhead phone stand : https://amzn.to/442KrwP
7. upReale Professional 11″ inch LED Ring Light with 7 Ft Tripod Stand Combo : https://amzn.to/3V8HXJa
Further Readings
READ – CONNECT – BOOST – CREATE