The current (I)-voltage (V) plot of a certain electronic device is given above. The device is

The current (I)-voltage (V) plot of a device that obeys Ohm's law is a straight line passing through the origin [2]. According to Ohm's law, the potential difference (V) across the ends of a conductor is directly proportional to the current (I) flowing through it, provided physical conditions like temperature remain constant [2]. This linear relationship results in a constant ratio of V/I, which represents the electrical resistance (R) of the conductor [3]. In contrast, devices like semiconductors (e.g., diodes) exhibit non-linear I-V characteristics where the current does not rise proportionally with voltage and often requires a threshold voltage to begin conduction. Superconductors would show zero voltage for a range of current, and insulators would show negligible current. Therefore, a linear I-V plot through the origin identifies a conductor obeying Ohm's law.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Figure 11.3 > p. 176
2. [2] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > What you have learnt > p. 192
3. [3] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Activity 11.5 > p. 183