The filament of a bulb is made extremely thin and long in order to achieve:
The correct answer is option (a) high resistance
The filament of a bulb is made extremely thin and long in order to achieve high resistance.
High resistance: When the filament is thin and long, it increases the length through which the current flows, thus increasing the resistance. The resistance RRR of a conductor is given by the formula:
R=ρ
where:
R is resistance, L is the length of the filament, A is the cross-sectional area of the filament
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90 Mins English English100 Questions100 Marks90 Mins English English100 Questions100 Marks90 Mins EnglishCurrent per unit area (taken normal to the current), l/A, is called ______.
An electric heater is rated at 800 W . If the supply voltage is 200 V . What is the current rating?
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