Devices A, B, and C are ohmic devices. Option 3.
About Ohmic device
An ohmic device, or an ohmic conductor, is a material that obeys Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points.
On a graph of current (I) versus voltage (V), an ohmic device is represented by a straight line passing through the origin. This line indicates a constant resistance (R) across the range of voltages, as per Ohm's Law (V = IR).
So, if you see a straight line on a current vs voltage graph that passes through the origin, you can identify it as an ohmic device. The slope of this line represents the resistance of the device.
Thus, looking at the graph in the attached image, devices A, B, and C are Ohmic devices.
shown below are the results of an experiment where four devices were connected across a variable voltage source. the voltage is increased and the current is measured. which device, if any, is ohmic device?
1. devices a, b, d.
2. Devices b, c, d
3. devices a, b, c.
4. Devices a and d.