1.

How many 40W,220V lamps can be safety connected to a 220V, 5A line? Justify your answer.

Answer»

Solution :The current DRAWN by a 40W,220V ELECTRIC LAMP `I_1=P_1/V=40/220=2/11 A`
As the electric line is of rating 220V, 5A hence we can connect n lamps in parallel where
`n=I/I_1=5/((2/11))=(5 times 11)/2=27.5`
THUS, we can safety connect 27 lamps of 40W,220V rating to a 220V,5A line.


Discussion

No Comment Found