Ohm's Law

What is Ohms Law? 

• Ohms law states that current flowing through a conductor and voltage is directly proportional with each other given that resistance of the conductor or circuit remains constant. 

V = I R

I = V / R 

          Where R is resistance of the circuit and it is a constant.

    Figure 1(Ohms Law Circuit Proteus)

Resistance:

• Resistance is the property of a conductor to oppose the flow of current through it.

R =  V / I 

•  Resistance is measured in Ohms(Ω).

• A component has a resistance of one ohm if a potential difference of one volt produce a current of one ampere through the component.

Current:

• Electric current is the flow of electric charge through a conductor. 

I =  Q / T

          where q is charge and t denotes time.

• Current is measured in Amperes(A).

• One ampere is equal to one coulomb of charge flowing through a point in every one second. 

1 A = 1 Coulomb / 1 second

Voltage:

• Voltage is defined as the electromotive force or potential difference between two points.

V = I R

• It is measured in volts(V).

• One volt is equal to 1 ampere of a current passing through a conductor with resistance of one ohm.