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

If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a

$3$ identical bulbs are connected in series and these together dissipate a power $P$. If now the bulbs are connected in parallel, then the power dissipated will be

A $5\,^oC$ rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately ........... $^oC$

In the circuit diagram shown, each battery is ideal having an e.m.f. of $1\  volt$. Each resistor has a resistance of $1\Omega $ Ammotor$(A)$ has a resistance of $1\Omega $ Find the reading of the ammeter and the total thermal power produced in the circuit 

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 ............... $\%$