Question

I-V characteristics of four devices are shown in figure. Identify devices that can be used for modulation:
(i)
(ii)
(iii)
(iv)
A. i and iii
B. only ‘iii’
C. ‘ii’ and some regions of ‘iv’
D. All the devices can be used

Answer 1

I-V stands for current and voltage which stands in difference between them. Here there are given four graphs between voltage and current. In this we have to find out which graph denotes the phase between current and voltage. Here in this we are going to discuss that relation.

Complete answer:
From the given four graphs we have to conclude the graphs. I-V characteristics are between current and voltage of an electrical component or device. When a current is measured the electronic component is applied as voltage across it. The relation between current and voltage shows in graphs or charts.

From the given graphs, graph (i) and (iii) shows the straight line in between current and voltage and graph (ii) and (iv) shows some curve lines in between them. From this the graph (ii) and (iv) is the characteristics of current and voltage. In those two graphs the I-V shows only some regions in graph (iv). Graph (ii) shows some square law whereas graph (iv) also shows some square law in some regions.

Hence, the correct option is C.

Note: From the given data we have characteristics between the current and voltage in that relation we have proved only graph (ii) and (iv) are the characteristics of I-V region.The remaining two regions have a straight line but the I-V characteristics have some curve in the graph as voltage increases in the graph.