Answers

2014-10-27T19:39:27+05:30
for 3 ohm I=V/R = 4.5/3 =1.5A ,
 for 1.5 ohm I= 4.5/1.5 = 3A and
 for 1 ohm I= 4.5/1 =4.5A
1 3 1
i need the currents of all the three resistors not the current of the main wire :)
for 3 ohm I=V/R = 4.5/3 =1.5A , for 1.5 ohm I= 4.5/1.5 = 3A and for 1 ohm I= 4.5/1 =4.5A
what if the parallel is connected to a resistor in series whose resistance is 8.5 ohm. will the answer be the same?
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2014-10-27T19:53:21+05:30
As we know that V=IR
Potential across parallel remain same means potential drop across on 3 resistance will be same
Current in 3 ohm is given by =V/R=4.5/3=1.5 A
Current in 1.5 ohm is given by =4.5/1.5=3 A
Current in 1 ohm resistance is given by=4.5 A 
1 5 1
and by the way its not bhai
Then effective resistance of the 3 parallel resistors is = 1 / (1+1/3+2/3) = 1/2 ohm. Total effective resistance in the circuit is 8.5 + 0.5 = 9 ohms. Current in the 8.5 ohms = 4.5/9 = 0.5 amp. Voltage across 3 parallel resistors is = 0.5*0.5 = 0.25 Volts. Now current in 1 ohm resistance is = 0.25 amp. Current in 3 ohms resistance is = 0.25V/3 = 1/12 amp. The current in 1.5 ohms resistor is 0.25/1.5 = 1/6 amp.
ok nitya
Now,Our effective resistance of three parallel resistor become a single resistance and this resistance is connected to 8.5 ohm with series, then effective resistance will be change
thanku Kvnmurthy