Question

Two bulbs of power 50w abd 60w work on 220v potential difference. If they are connected in parallel, how much current will flow in main conductor? ​

Answer 1

OK

POTENTIAL DIFFERENCE=220V

POWER

50W AND 60W

SO RESISTANCE

FOR 50W

RESISTANCE=(220×220)/50=968 ohms

FOR 60W

RESISTANCE=(220×220)/60

=806.67 ohms


AS THEY ARE IN PARALLEL
THE SAME CURRENT FLOWS THROUGH THEM

AND TOTAL RESISTANCE
=(1/968+1/806.67)^-1
=
(968+806.67/780856.56)^-1
=440 ohms
now
current=potential difference/resistance
=220/440
=0.5 ampere