Three $2\,\Omega $ resistors, $A, B$ and $C$, are connected as shown in Figure. Each of them dissipates energy and can withstand a maximum power of $18\,W$ without melting. Find the maximum current (in $A$) that can flow through the three resistors?
$0.33$
$0.67$
$1.25$
$1.5$
Of the two bulbs in a house, one glows brighter than the other. Which of the two has a larger resistance ?
In the circuit diagram shown, the two resistance wires $A$ and $B$ are of same area of cross-section and same material, but $A$ is longer than $B .$ Which ammeter $A_{1}$ or $A_{2}$ will indicate higher reading for current ? Give reason.
A conducting wire offers resistance to the flow of electrons because electrons repel each other in the wire.
What are the conditions under which $Ohm's$ law is not obeyed ?
Tungsten is used almost exclusively for filaments of electric bulb. List two reasons.