$A$ bulb with a rating of $4.5 \, W, 1.5 \, V$ is connected as shown in the figure. To make the bulb glow at full brightness,the $e.m.f.$ of the cell should be ................ $V$.

In the given circuit, the potential difference between points $P$ and $Q$ is . . . . . . (in $\text{ V}$)

In the given circuit,the current in $8 \Omega$ resistance is $1.5 \text{ A}$. The total current $(I)$ flowing in the circuit is (in $\text{ A}$)

$A$ battery of internal resistance $4\,\Omega$ is connected to a network of resistors as shown in the figure. If maximum power is to be delivered to the network,the magnitude of $R$ in $\Omega$ should be:

Two resistances of $400 \Omega$ and $800 \Omega$ are connected in series with a $6 \text{ V}$ battery of negligible internal resistance. $A$ voltmeter of resistance $10000 \Omega$ is used to measure the potential difference across the $400 \Omega$ resistor. The error in the measurement of potential difference in volts is approximately:

Of the two bulbs in a household circuit,one glows brighter than the other. Which of the two bulbs has a larger resistance?