Current Electricity

In the circuit shown in the figure, find the current in $45 \Omega$.

The magnitude and direction of the current in the following circuit is

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?

The total power dissipated in watt in the circuit shown here is:

A battery consists of a variable number 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terminals of the battery are short-circuited and the current $I$ is measured. Which…

Three resistors having resistances $r_{1},r_{2}$ and $r_{3}$ are connected as shown in the given circuit. The ratio $\frac{i_{3}}{i_{1}}$ of currents in terms of resistances used in the circuit is :

$\text{A}$ , $\text{B}$ and $\text{C}$ are voltmeters of resistance $\text{R}$ , $\text{1}\text{.5 R}$ and $\text{3 R}$ respectively as shown in the figure. When some potential difference is applied between $\text{X}$…

Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column - II gives some mathematical relations involving electrical quantities. Match Column - I and Column - II with…

A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of $2.0V$ and a negligible internal resistance. The…

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer. Reason R: The layer…

The resistance of platinum wire at $0^{\circ}C$ is $2\Omega\,$ and $6.8\Omega\,$at $80^{\circ}C$. The temperature coefficient of resistance of the wire is:

The resistance of a wire is $R$ ohm. If it is melted and stretched to $n$ times its original length, its new resistance will be