Electric current is the ow of charges along a definite direction and t

Electric current is the ow of charges along a definite direction and take place through metals as well as semiconductors.1. Mention the charge carriers in the above cases.2. Give the sketch of graph with V along X-axis and I along Y-axis for a metal at room temperature.3. Give the physical significance of the slope of the graph.4. If the above graph is drawn at 100°C, compared the nature of the graph with the graph at room temperature.

Answer»

1. Metals – electrons

Semiconductor – Electrons and holes

2. Straight line graph

3. Slope gives conductance

4. When the temperature increases, resistance is also increased and hence slope decreases.