A 100 W bulb is designed to operate at 220 V. If it is connected across a 110 V source, assuming the resistance remains constant, what power will it dissipate?

If ${R_1}$ and ${R_2}$ are respectively the filament resistances of a $200\,\,watt$ bulb and $100\,\,watt$ bulb designed to operate on the same voltage, then

For a thermocouple, the neutral temperature is 270\,{\,^0}{\rm{C}} and the temperature of its cold junction is 20\,{\,^0}{\rm{C}}. If there is no deflection in the galvanometer, the temperature of the hot junction should be

When ${\rm{1 g}}$ hydrogen (ECE=$1.044\,\, imes \,\,{106^{ - 8}}\,\,{\rm{kg}}\,{{\rm{C}}^{ - 1}})$ forms water, ${\rm{34}}\,\,{\rm{kcal}}$ heat is liberated. The minimum voltage required to decompose water is

Two wires $A$ and $B$ of same material and mass have their lengths in the ratio ${\rm{1:2}}$. On connecting them to the same source, the rate of heat dissipation in $B$ is found to be $5\,\,W$. The rate of heat dissipation in $A$ is

Three bulbs of $40\,\,W,\,\,60\,\,W,\,\,100\,\,W$ are arranged in series with $220\,\,volt$ supply. Which bulb has minimum resistance

If the current through a resistor is doubled, the power dissipated will:

Tap supplies water at 20\,{\,^0}{\rm{C}}. A man takes ${\rm{1}}\,\,{\rm{L}}$ of water per minute at 35\,{\,^0}{\rm{C}} from a geyser connected to the tap. The power of geyser is

If a $2\,\,kW$ boiler is used everyday for ${\rm{1 hour}}$, then electrical energy consumed by boiler in thirty days is

Heat produced in a wire of resistance $R$ due to current flowing at constant potential difference is proportional to

Two bulbs consume same power when operated at ${\rm{200}}\,\,{\rm{V}}$ and ${\rm{300}}\,\,{\rm{V}}$ respectively. When these bulbs are connected in series across a ${\rm{DC}}$ source of ${\rm{400 V}}$, then the ratio of power consumed across them is