The total effective resistance of the circuit can be reduced by connecting electrical appliances in parallel.

Two cells of emf $2E$ and $E$ with internal resistance $r_1$and $r_2$ respectively are connected in series to an external resistor $R$ (see figure). The value of $R,$ at which the potential difference across the terminals of the first cell becomes zero is

What is the time $t$ taken by the capacitor in the given circuit to charge to $\frac{1}{\sqrt{2\pi }}$ of its full capacity?

Apart from the live wire, what are the two other wires in the household circuit?

For the circuit shown in the figure, the current $I$ will be

The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire? 

$ADC$ source with internal resistance $R_0$ is connected to circuit as shown in the figure. The value of $R$ for which the power generated in the circuit is the maximum is

In the given circuit, an ideal voltmeter connected across the $10 \mathrm{\Omega }$ resistance reads $2\mathrm{ }\mathrm{V}$ . The internal resistance $r$, of each cell is:

Six cells, each of emf $5\mathrm{V}$ and internal resistance $0.1\mathrm{\Omega }$ are connected as shown in Figure. The reading of the ideal voltmeter $\mathrm{V}$ is

Eels can generate current with biological cells called electroplaques. The electroplaques in an eel are arranged in $100$ rows, each row stretching horizontally along the body of the fish containing $5000$ electroplaques. The arrangement is suggestively shown below. Each electroplaque has an emf of 0.15 V and internal resistance of $\text{0.25 Ω}$. What is the value of current through $\text{500 Ω}$ in given circuit?