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1) Parallel combination since the voltage 60V remains constant.
2) • There is no division of voltage among the lamps
• The effective resistance remains the minimum due to which there is less current and power loss.
3) Resistance is proportional to V/I
C has the lowest resistance = 60/5 = 12 ohm
C will glow the brightest.
4) Ra =V/I = 20 ohm
Rb = 60/4 = 15 ohm
Rc =60/5 = 12 ohm
Rd = 60/3 = 20 ohm
1/Req = 1/Ra + 1/Rb + 1/Rc + 1/Rd
= 1/20+1/15+1/12+1/20
= 1/10 + 3/20
= 5/20 = 1/4
Req = 4 ohm.
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