The resistor of resistance $R$ is connected to a $25\, V$ supply and the heat produced in it is $25\, J/s$. The value of $R$ is .......... $\Omega$.

The heat produced per unit time,on passing electric current through a conductor at a given temperature,is directly proportional to . . . . . . .

Two identical electric lamps marked $500\, W, 220\, V$ are connected in series and then joined to a $110\, V$ line. The power consumed by each lamp is

An electric power line having a total resistance of $2 \ \Omega$ delivers $1 \ kW$ of power at $250 \ V$. The percentage efficiency of the transmission line is: (in $\%$)

Which of the following curves represents the relationship between the heat produced in a resistor and the current flowing through it?

Find the number of electrons flowing through the filament of a $120 \ V, 60 \ W$ electric lamp in one second.