Question

The diode characteristic curve is a plot between,
(A) Current and time
(B) Voltage and time
(C) Voltage and current
(D) Voltage and resistance

Answer 1

Hint : The characteristics curve of a diode is sufficient for us to infer that a diode is not an Ohmic device. An Ohmic device is a device which does not obey ohm's law.

Complete step by step answer
A diode is generally stated to be a device which allows current to flow in one direction only. A diode in its most basic form is simply made by the combination of two different types of semiconductors, called P type and N type. This type of diode is called a PN diode, or a PN Junction diode. A diode can be said to be biased in two ways, forward bias configuration and reverse bias configuration. Forward bias is when the positive terminal of a voltage source is connected to the P end of the diode and the negative terminal connected to the N end of the diode.
Like a resistor, in forward bias configuration, a diode will conduct current at specific potential difference. However, unlike a resistor, the diode has a knee voltage below which current is effectively zero. And also the voltage current relationship is not exactly a straight line and thus, does not over ohm's law. This voltage-current relationship is called the characteristic curve of the diode.
Hence, the characteristic curve is a relationship between current and voltage.
Thus, the correct answer is C.

Note
In reverse bias (when positive voltage source terminal is connected to N end of the diode), is said to not allow current to flow, however, in actuality, the diode has a breakdown voltage in which beyond this voltage, the diode conducts current even in reverse bias. This way, the diode is said to be spoilt. Also, In application, since it allows current to flow in one direction only, the diode is used to rectify ac voltages and currents.