A house, served by ${\rm{220}}\,\,{\rm{V}}$ supply line, is protected by a ${\rm{9}}\,\,{\rm{A}}$ fuse. The maximum number of ${\rm{60}}\,\,{\rm{W}}$ bulbs in parallel that can be turned on is

A thermo couple develops $200\,\,\mu {\rm{ }}V$ between 0\,{\,^0}{\rm{C}} and 100\,{\,^0}{\rm{C}}. If it develops $64\,\,\mu {\rm{ }}V$ and $76\,\,\mu {\rm{ }}V$ respectively between \left( {0\,{\,^0}{\rm{C}} - 32\,{\,^0}{\rm{C}}} \right) and \left( {32\,{\,^0}{\rm{C}} - 70\,{\,^0}{\rm{C}}} \right) then what will be the thermo $emf$ it develops between 70\,{\,^0}{\rm{C}} and 100\,{\,^0}{\rm{C}}

A silver and a zinc voltmeter are connected in series and a current $I$ is passed through them for a time $t$, liberating w gram of zinc. The weight of silver deposited is nearly

A 10 Ω electric heater operates on a ${\rm{110}}\,\,{\rm{V}}$ line. The rate at which heat is developed in watts is

The electric current passing through a metallic wire produces heat because of

A 10 Ω electric heater operates on a ${\rm{110}}\,\,{\rm{V}}$ line. The rate at which heat is developed in watts is

If ${\rm{100}}\,\,{\rm{kWh}}$ of energy is consumed at ${\rm{66}}\,\,{\rm{V}}$ in a copper voltmeter, then the mass of copper liberated will be (Given ,ECE of ${\rm{Cu}} = 0.33\,\, imes \,\,{10^{ - 6}}\,\,{\rm{kg}}\,\,{{\rm{C}}^{ - 1}})$

A lamp of $600W - 240V$ is connected to $220V$ mains. Its resistance is

Two electric bulbs whose resistances are in the ratio of $1:2$ are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio.

Two bulbs, one of $50\,\,watt$ and another of $25\,\,watt$ are connected in series to the mains. The ratio of the currents through them is

If the cold junction is held at 0\,{\,^0}{\rm{C}}, the same thermo-emf $V$ of a thermocouple varies as $V = 10\,\, imes \,\,{10^{ - 6}}\,\,t - \frac{1}{{40}}\,\, imes \,\,{10^{ - 6}}\,\,{t^2}$, where $t$ is the temperature of the hot junction in $^0{\rm{C}}$. The neutral temperature and the maximum value of thermo-emf are respectively