An electric heater rated 1000 W is used for 5 hours daily. For cost per unit of ₹6.00,calculate the total cost for running the device for the month of September (in ₹)?
A900
B500
C180
D150
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- (a) Filament can be made of tungsten or nichrome.
- (b) The glass envelope covering the filament is filled with inactive gases such as nitrogen or argon.
- (c) Since the filament used is thin, its resistivity is very low.
- (d) The resistivity of the filament is low to allow more current.
- (e) The filament material used should have high melting point.
In a typicar H-R diagram, stars are graphed by these two characteristics.