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 calculation. If a graph is plotted between $V$ and $I,$ show the nature of the graph obtained.
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 calculation. If a graph is plotted between $V$ and $I,$ show the nature of the graph obtained.
$(b)$ Here, Current $( I )=0.4 A$
Potential difference $( V )=2 V$
$V = IR$
or $R =\frac{2 V }{0.4 A }=5 \Omega$
$(c)$ $Ohm's$ law is applied. The $V-I$ graph will be a straight line that passes through the origin of the graph.
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