A heating coil is rated 220 V and 1000 W. If the coil's operating voltage is reduced by 10% while maintaining a constant current, what is the new power dissipation?

(1)The product of a volt and a coulomb is a joule

(2)The product of a volt and an ampere is a joule $/$ second

(3)The product of volt and watt is horse power

(4)Watt-hour can be measured in terms of electron volt

State if

A thermocouple of negligible resistance produces an $e.m.f.$ of 40\,\,\mu V/\,{\,^{0\,}}C in the linear range of temperature. A galvanometer of resistance $10\,\,ohm$ whose sensitivity is $1\,\,\mu A/div$, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be

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 ${\rm{Cu}} = 0.33\,\, imes \,\,{10^{ - 6}}\,\,{\rm{kg}}\,\,{{\rm{C}}^{ - 1}})$

The resistance of hot tungsten filament is about ${\rm{10}}\,\,{\rm{times}}$ the cold resistance. What will be the resistance of ${\rm{100}}\,\,{\rm{W}}$ and ${\rm{200}}\,\,{\rm{V}}$  lamp, when not in use?

A current $I = 2t - 3t^2$ flows through a resistor of $5\Omega$. Calculate the total heat produced in the resistor between $t=0$ and the time when the current becomes zero.

In a thermo-couple, one junction which is at 0\,^\circ C and the othe at $t{\mkern 1mu} {\mkern 1mu} ^\circ C$ the emf is given by $E = a{t^2} - b{t^2}$. The neutral temperature is given by

The thermo emf produced in a thermo-couple is ${\rm{3}}$ microvolt per degree centigrade. If the temperature of the cold junction is 20\,{\,^0}{\rm{C}} and the thermo emf is ${\rm{0}}{\rm{.3}}$ millivolt, the temperature of the hot junction 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

If an electric current is passed through a nerve of a man, then man

The production of $e.m.f.$ by maintaining a difference of temperature between the two junctions of two different metals is known as