Question

What is the necessary condition for ohm's law. What is the nature of V vs I graph? How resistance can be obtained from the graph? Two lamps one rated 100w at 220 v and other 60w at 220v are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220v?

Answer 1

Explanation:

Necessary condition for ohm law :

All physical condition be same like Temperature , pressure , Humidity ,mechanical strain etc ) then the potential difference across the end of conductor is directly proportional to the current flowing through conductor.

2. For ohmic conductor ∆V / I is constant and = R.

For ohmic conductor like metallic conductor the nature of graph is in Straight line.

3. The resistance can obtained by finding the slope of ( ∆V / I ) in graph

Answer 4th refer in Attachment.

Thank you