Ohm’s law

Ohm’s Law


The most fundamental law in electricity is ”Ohm’s law”

figure of Ohm' law

 Statement :

“Voltage across the resistance is directly proportional to the current. current flowing through resistance and keep the resistance constant.”

“Ohm’s law” gives the relation between voltage, current and resistance.

V = IR

Where,

  • Voltage (V) is the difference in charge between two potential.
  • Current (I) is flow of charge(electron) in close circuit or path.
  • Resistance (R) is a material’s tendency to resist the flow of charge(current).

Series and parallel circuits


  • Two or more resistors can be connected in series, If the current can split (i.e. there is more than one way for the current to flow). When two resistors R1 and R2 are connected in series, the equivalent resistance RS is given by

Rs = R1 + R2

 if it contained a single resistor with resistance Rs — that is, it draws current from a given applied voltage like such a resistor.


  • When those same resistors are connected in parallel instead, we use a different formula for finding the equivalent resistance.

Using these relationships, a complex circuit can be redrawn as a circuit with a single resistor.

 Limitation:

  1. Where temperature is remaining constant because resistance vary with the temperature and we need to resistance keep constant.
  2. Ohm’s law is applicable for both DC and AC circuits.

resistance (R) is replace by impedance (Z) in AC circuit.

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