13 Questions
What part of a heating equipment converts electric energy into heat energy?
Heating coil
Which substance is commonly used to make the heating coil of a heating appliance?
Tungsten
What does the marking '100 W' on an incandescent lamp indicate?
Wattage
What is the highest resistance that can be obtained using resistances of 4 Ω, 6 Ω, and 12 Ω?
$22 , Ω$
What is the lowest resistance that can be obtained using resistances of 6 Ω and 12 Ω?
$2 , Ω$
What quantity of charge flows through the circuit in 5 minutes if a 2A current flows through an electric heating device connected to a 230V supply?
$34,500 , C$
What is the purpose of using hydrogen or nitrogen at low pressure in incandescent lamps?
To prevent vaporization of the filaments
If the intensity of electric current in a circuit is doubled, what happens to the heat energy developed in this circuit?
It quadruples
Which of the following light sources does not contain mercury?
LED
What are two characteristic properties of the material used as a heating coil in heating devices?
High resistivity and low melting point
How is light energy produced in discharge lamps?
Through excitation of gas atoms or molecules
(a) What material is used as the filament in incandescent lamps? (b) What are the characteristic properties of this material? (c) Why are these lamps filled with nitrogen?
Tungsten, high melting point, prevents oxidation
Why does a heater with a low resistant heating coil get heated more?
Its resistance decreases with temperature
Test your knowledge about incandescent lamps, discharge lamps, and heating appliances in this quiz. Explore questions about the working principles, characteristics, and advantages of different types of lamps.
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