Two heating coils, one of fine wire and the other of thick wire of the same material and of the same length are connected in series and in parallel. Which of the following statement is correct
In series fine wire liberates more energy while in parallel thick wire will liberate more energy
In series fine wire liberates less energy while in parallel thick wire will liberate more energy
Both will liberate equally
In series the thick wire will liberate more while in parallel it will liberate less energy
Explain electrical energy and power.
Two bulbs of $500\, watt$ and $200\, watt$ are manufactured to operate on $220\, volt$ line. The ratio of heat produced in $500\, W$ and $200\, W$, in two cases, when firstly they are joined in parallel and secondly in series, will be
The current flowing through a lamp marked as $50\, W$ and $250\, V$ is ............. $amp$
If voltage across a bulb rated $220$ $volt-$ $100$ $watt$ drops by $2.5\%$ of its rated value, the percentage of the rated value by which the power would decrease is ............... $\%$
The resistance of the filament of an electric bulb changes with temperature. If an electric bulb rated $220\, volt$ and $100\, watt$ is connected $(220 \times 0.8)$ $volt$ sources, then the actual power would be