You are given a resistance wire of length $50 \,cm$ and a battery of negligible resistance. In which of the following cases is the largest amount of heat generated
when only half of the wire is connected to the battery.
when the wire is divided into two equal parts and both the parts are connected in parallel.
when the wire is connected to the battery directly.
when the wire is divided into four equal parts and all the four parts are connected in parallel.
The equivalent resistance between points $A$ and $B$ in the following electric circuit is $.....$
Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of $1.5\, V$, $5\, \Omega, 10\, \Omega$ and $15\, \Omega$ resistors and a plug key, all connected in series.
$1\;kWh =\ldots\ldots$ $joule$
Calculate the number of electrons constituting one coulomb of charge.
(Charge on one electron $=1.6 \times 10^{-19} C$ )
You are qiven three bulbs of $25 \,W , 40\, W$ and $60 \,W$ marked at $220\, V$. Which one of them has lowest resistance ?