Posted by Amber. on Wednesday, May 20, 2009 at 12:40pm.
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.
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 thru 20 ohms, I = E/r = 63.1/20 = 3.15
Yes, you're right! I missed the last part that stated "through the 20.0 resistor".
Sorry about that
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