How many electrons will there be in $1.6\, C$ charge?

A current of $1$ ampere flows in a series circuit containing an electric lamp and a conductor of $5\,\Omega $ when connected to a $10\, V$ battery. Calculate the resistance of the electric lamp.

Now if a resistance of $10\,\Omega $ is connected in parallel with this series combination, what change (if any) in current flowing through $5\,\Omega $ conductor and potential difference across the lamp will take place? Give reason.

$(a)$ Explain how does a cell maintain current in a circuit.

$(b)$ In the circuit given below the resistance of the path $x T y=2\, \Omega$ and that of $x Z y=6, \Omega$.

$(i)$ Find the equivalent resistance between $x$ and $y.$

$(ii)$ Find the current in the main circuit.

$(iii)$ Calculate the current that flows through the path $x T y$ and $x Z y$.

A student carries out an experiment and plots the $V-I$ graph of three samples of nichrome wire with resistances $R_1, R_2$ and $R_3$ respectively (Figure.). Which of the following is true?

State $Ohm's$ law. Calculate the resistance of a conductor, if the current flowing through it is $0.2 \,A$ when the applied potential difference is $0.8\, V$.

Give a single word for $\frac{1 \text { joule }}{1 \text { coulomb }}$.