A $100\, watt$ bulb working on $200 \,volt$ and a $200\, watt$ bulb working on $100\, volt$ have
Resistances in the ratio of $4 : 1$
Maximum current ratings in the ratio of $1:4$
Resistances in the ratio of $2 : 1$
Maximum current ratings in the ratio of $1 : 2$
For driving a current of $2\, A$ for $6$ minutes in a circuit, $1000\, J$ of work is to be done. The $e.m.f.$ of the source in the circuit is ................ $V$
Two electric lamps of $40\, watt$ each are connected in parallel. The power consumed by the combination will be ........... $watt$
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
Two electric bulbs ($60\,W$ and $100\,W$ respectively) are connected in series. The current passing through them is
The supply voltage to room is $120\ V$. The resistance of the lead wires is $6\,\Omega$ . A $60\ W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\ W$ heater is switched on in parallel to the bulb? ............. $V$