Question

When a high resistance voltmeter is connected directly across an electric bulb, its reading is 2 V. An
electric cell is sending the current of 0.4 ampere (measured by an ammeter) in the electric circuit.
(a) Draw the circuit.
(b) Find the resistance of the electric bulb,
(c) State the law that is applied for making these calculations. If a graph is plotted between V and I,
show the nature of the graph obtained.

Answer 1

Explanation:

b).R=v/I

R=2/0.4

R=2×10/0.4×10

R=20/4

R=5 .ohm

c).ohm is applied to calculate resistance.

ohms law states that the potential difference between the two end of metallic wire is directly proportional to current flowing through the circuit . it provides a temperature remains constant.