Asked by Amber.
A 15.0- resistor and a 20.0- resistor are connected in parallel. A 5.00- resistor is connected in series with this parallel arrangement. The resistors are connected across a 1.00 10^2-V battery. What is the current flowing through the 20.0- resistor?
IS it 3.15 A?
IS it 3.15 A?
Answers
Answered by
Quidditch
That's not what I got.
The equivalent resistance of the 20 ohm and 15 ohm resistors in parallel is, in ohms, (20 * 15)/(20 + 15). Add that to the 5 ohm resistor connected in series. Finally divide the applied voltage, 100 volts, by the total resistance to get the current.
The equivalent resistance of the 20 ohm and 15 ohm resistors in parallel is, in ohms, (20 * 15)/(20 + 15). Add that to the 5 ohm resistor connected in series. Finally divide the applied voltage, 100 volts, by the total resistance to get the current.
Answered by
Amber.
I got it like this :
two in parallel are equal to 15*20/35 = 8.57 ohms
that in series with 5 ohms gives you 13.57 ohms
I = E/R = 100/13.57 = 7.37 amps total current.
voltage across parallel combo is E = IR = 7.37 x 8.57 = 63.1 volts
current through 20 ohms, I = E/r = 63.1/20 = 3.15
two in parallel are equal to 15*20/35 = 8.57 ohms
that in series with 5 ohms gives you 13.57 ohms
I = E/R = 100/13.57 = 7.37 amps total current.
voltage across parallel combo is E = IR = 7.37 x 8.57 = 63.1 volts
current through 20 ohms, I = E/r = 63.1/20 = 3.15
Answered by
Quidditch
Yes, you're right! I missed the last part that stated "through the 20.0 resistor".
Sorry about that
Sorry about that
Answered by
Anonymous
thanks