Open circuit (oc)

OPEN CIRCUIT (OC)

Open circuit between any terminals can be defined in terms of the figure below:

The current in an open circuit is always zero regardless of the voltage across it. Mathematically

i = 0 and V(t) = ≠ 0, for open circuit.

Consider the following 2 illustrations.

Illustration 3: Refer the circuit given.

As there is no closed circuit, current = 0.

Illustration 4: Consider the circuit given.

Suppose that the resistance R₃ is burnt (damaged), then it acts as an open circuit.

As a result, the circuit becomes as shown above. Therefore, the current flowing through R₁ and R₂ will be the same. i.e., they are in series. So, R_T = R₁ + R₂

Hence, current from source = V₁ / R₁ + R₂