A parallel circuit has two 8.0-ohm resistors and a power source of 9.0 volts. If a 12.5-ohm resistor is added to the circuit in parallel, how will the current be affected and what value will it have?

A. current will increase;2.97
B. current will increase;0.55
C. current will decrease;2.97
D. current will decrease;055

Question

A parallel circuit has two 8.0-ohm resistors and a power source of 9.0 volts. If a 12.5-ohm resistor is added to the circuit in parallel, how will the current be affected and what value will it have?


A. current will increase;2.97
B. current will increase;0.55
C. current will decrease;2.97
D. current will decrease;055

agent0smith · Answer

Find the total resistance first using this formula (since they're in parallel)

$$\huge \frac{ 1 }{ R_T} = \frac{ 1 }{R_1 }+\frac{ 1 }{R_2 } + \frac{ 1 }{ R_3 }$$

then just use V=IR to find the new current.

anonymous · Answer

so the answer is A

agent0smith · Answer

idk, i didn't work out the answer...

agent0smith · Answer

Current will increase tho, since adding resistors in parallel decreases total resistance.

anonymous · Answer

What is the current in a parallel circuit which has two resistors
(17.2 ohms and 22.4 ohms) and a power source of 6.0 volts