Tag: applications of heating effect of electric current

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Questions Related to applications of heating effect of electric current

Multiple choice physics electric current and its effects heating effect of electric current- uses applications of heating effect of electric current coil and fuse

Mark the correct reason/s why nichrome is used for making heating element of electrical appliances. 

  1. Nichrome does not oxidize

  2. Nichrome doesn't burn easily at high temperatures as it has higher melting and boiling point than metals

  3. Nichrome has higher resisistivity and consequently a higher resistance

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nichrome is used for making heating element of electrical appliances. Because nichrome does not oxidize and burn easily at high temperature i.e.it has higher melting and boiling point than metals. Thus it does not melt even when a large amount of heat is produced due to passage of current. Moreover, It has higher resisistivity and consequently a higher resistance.Therefore, it will resist the flow of charges more, and lead to development of heat faster.

Multiple choice physics electric current and its effects heating effect of electric current- uses applications of heating effect of electric current coil and fuse

Mark the correct reason why tungsten is used for making filament of electric lamp.

  1. Tungesten oxidises easily

  2. It has low boiling point

  3. It has high melting point

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).