Tag: physics
Questions Related to physics
Thermal energy produced by the resistance R in time duration 1 $ \mu s $. using the source at resonance condition is
Current through resistor of resistance $R$ varies with time as $I = I _ot$. What will be the time taken to deliver heat $H$ by this resistor?
If p.d. across a conductor is constant and resistivity of its material is $\rho $, the joule heat produced in 1 s is proportional to ..
A coal based thermal power plant producing electricity operates between the temperatures $27^o C$ and $227^o C$ The plant works at 80% of its maximum theoretical efficiency. Complete burring of 1 kg of coal yields 3600 KJ of heat. A house needs 10 units of electricity each day. Coal used for supplying the amount of energy for the house in one year is
Two equal resistance when connected in series to a battery, consume electri power of 60 w. If these resistnce are now connected in parallel combination to the same battery the electric power consumed will be
The formula used to calculate the heat produced in a conductor is
Commonly used heating element are made of:
Why filament of electric bulb is made of tungsten
The operating temperature of the filament of lamp is ${ 2000 }^{ 0 }C$. The temperature coefficient of the material of filament is ${ 0.005 }^{ 0 }{ C }^{ -1 }$. If the atmospheric temperature is ${ { 0 }^{ 0 }C }$, then the current in the 100W-200W lamp when it is switched on is nearest to
Which is not different between primary and secondary cell ?