What is the $SI$ unit of electric potential?

What is the resistance of an ideal ammeter?

The equivalent resistance between points $A$ and $B$ of the following electric circuit will be $.........$

The $V-I$ graphs for two resistors of the same material and the same radii with lengths $L_{1}$ and $L_{2}$ are shown below. If $L_{1} > L_{2}$, state with reason, which of these graphs represents voltage-current change for $L_{1}$?

Given below is a circuit showing current flowing in it. Identify each component $A, B, C, D$ of this circuit.

$A$ 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?