A 10.0 Ω resistor is in parallel with a 20.0 Ω resistor and supplied by a 9.0 V battery. What is the current passing through the 20.0 Ω resistor?

0.90 A

0.45 A

6.00 A

1.35 A

i think its B, however im not sure?please explain the equation ? thank you

jjennylove Apr 15, 2020

#1**+1 **

Again....the resistors are wired in PARALLEL ....so they BOTH have 20v applied across them

v/r = i 9v / 20 ohm =.......A

ElectricPavlov Apr 15, 2020

#2**+1 **

the answer actually ended up being B , hmm im not sure then. Maybe im not understanding this as much as i thought

jjennylove
Apr 15, 2020

#3**+1 **

As an exercise let's find the current through the 10 ohm resistor

9v/10 ohm = .9 A

so the total current is thus .45 + .9 = 1.35 A

the resultant resistance is thus 9 v/ 1.35 A = R = 6 .667 ohm

Is this true?

Calculate the resultant resistance of the two resistors in parallel 1/ (1/10 + 1/20) = 6.667 ohm ! TRUE !

ElectricPavlov
Apr 15, 2020