$A$ current of $0.5\, A$ is drawn by a filament of an electric bulb for $10$ minutes. Find the amount of electric charge that flows through the circuit. (in $C$)

$1 \; kWh = \ldots \ldots \ldots \; \text{watt-seconds}$

Name a device that can be used to maintain a potential difference across a conductor. Also,draw its circuit symbol.

What is the resistance of an ideal voltmeter?

What is the equivalent resistance between points $A$ and $B$ in the given electrical circuit (in $\Omega$)?

$A$ 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?