Question

The resistance of an open circuit is:
A. Infinity
B. Zero
C. Negative
D. Can’t be predicted

Answer 1

Hint: A circuit is said to be open when it is incomplete and no current flows through any of the terminals.

Complete step by step answer:The circuit which is incomplete is considered as an open circuit. As the electricity does not flow from an active energy source to the desired endpoint of the circuit. In an open circuit, there is no path from higher voltage to lower voltage and thus no current flows in the circuit.
The Circuits which have faulty wiring or missing components and are manually disconnected and switched off or have blown fuses. These are all considered as open circuits.
A short circuit describes that the two terminals are externally connected with resistance R=0. Thus, it means that for any current value there is zero voltage difference and there is non-zero resistance in real wires.
An open circuit describes that the two terminals points are externally disconnected. This is equivalent to a resistance Infinity. Thus, it means that zero current can flow between the two terminals.
Thus, as no current passes through the circuit
As we know that, the formula for Resistance is as follows,
\[R = \dfrac{V}{I}\],
Here the Current is 0 Ampere.
That leads the resistance much higher which is equal to infinity.

So, the Correct Answer is Option B

Note:No current flows through any of the terminals in the Open Circuit, regardless of any voltage difference. Also, high voltages can cause current to flow even over large air and vacuum gaps.