For a cell, a graph is plotted between the potential difference $V$ across the terminals of the cell and current $I$ drawn from the cell (see fig.) The emf and internal resistance of the cell are $E$ and $r$ respectively, then :

Write Ohm's law. Draw a circuit diagram to prove it experimentally in the laboratory.

In figure $R_1=10 \mathrm{\Omega }, R_{\mathit{2}}=40\mathit{ }\mathrm{\Omega }, R_3=30\mathit{ }\mathrm{\Omega }, R_4=20 \mathrm{\Omega }, {\mathrm{R}}_5=60 \mathrm{\Omega }$ and a $12 \mathrm{V}$ battery is connected to the arrangement. Calculate:

(a) Total resistance in the circuit.

(b) Total current flowing in the circuit.

The potential difference between the two ends of a conductor is $V$, and the current flowing through the conductor is $I$. At a constant temperature, which of the following statement is true for the conductor?

Establish relation between potential difference $V$ and electric current $I$ by plotting graph.

How is the concept of resistance obtained from Ohm's law?

State and explain Ohm's Law.

A $V-I$ graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.

A current of $1 \mathrm{A}$ flows when an electric bulb is connected to $220 \mathrm{V}$ mains. What would be the current when the same bulb is connected to a $110 \mathrm{V}$ main?

Following figures shows graph of $I-V$. Which graph is correct according to Ohm's law?

Write Ohm's law.

The values of current ($I$) flowing through a given resistor of resistance ($R$), for the corresponding values of potential difference ($V$) across the resistor, are as given below:

Plot a graph between current ($I$) and potential difference ($V$) and determine the resistance ($R$) of the resistor.