Question

When a high resistance voltmeter is connected directly across a resistor,its reading is 2v . An electric cell is sending the current of 0.4A in the electric circuit in which a rheostat is also connected to vary the current. ( i ) draw labeled circuit for the given data . (i) name and state the law applicable in the given case.

Answer 1

the law applicable here is ohms law

acc to ohms law the potential difference across to ends of the conductor is directly proportional to the current flowing through the conductor

V is directly proportional to I

Answer 2

Explanation:

Given that,

Voltmeter = 2 v

Current = 0.4 A

(I). We need to draw the circuit

When a high resistance voltmeter directly across a resistor. An electric cell is sending current in the circuit in which a rheostat is also connected.

(II). The law applicable is ohm's law

Ohm's law is defined as,

The current flowing through the conductor is directly proportional to the voltage difference.

In mathematically term

$V = IR$

Where, V = potential difference

R = resistance

I = current

We draw the voltage -current graph

This graph shows the straight line.