1.

State the function of a fuse' in an electric circuit. A circuit has a fuse of 5A. Find the maximum number of 100 W, 220 V lamps that can be used in this circuit.

Answer»

Solution : It prevents damage to the APPLIANCE due to overloading or SHORT circuiting
`(P)/(V) = (1500 W)/(220 V) = 6.8` A
Current rating (Maximum current ) = 5 A
`therefore ` No of lamps =
`("Current rating ")/("Current through one lamp") = (5)/((10)/(22))= 11. `


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