Applications of heating effect of electric current - class-VIII
Description: applications of heating effect of electric current | |
Number of Questions: 23 | |
Created by: Muni Gupte | |
Tags: electricity effects of electric current physics electrical appliances in everyday life effect of electric current effects of current electric current and its effects |
From below which are the applications of heating effect of electric current?
Why are bulbs filled with chemically inactive Nitrogen or Argon gas?
An electric fuse used in households works on which principle of:
Why is electric power transmitted over long distances at high voltage?
A vertical wire caries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected
When a metallic conductor is heated then the atoms in the metal vibrate with ?
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
The heating element in an electric iron is made up of :
An electric iron is based upon the principle of
The overheating of electrical wiring in any circuit due to the flow of large current through it is called _________ of the electric circuit.
Electrical welding works on principle of:
Which of the following equipment does not work on principle of Joule's law?
Mark the correct reason/s why nichrome is used for making heating element of electrical appliances.
Mark the correct reason why tungsten is used for making filament of electric lamp.
Device which works on Joule's law of heating