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October 21, 2014

Homework Help: physics

Posted by Nilan - still need help on Thursday, May 19, 2011 at 8:21pm.

Please check my work here:

Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor.
The circuit voltage is 180 volts.

Find:
a)the voltage of the parallel circuit

b)the voltage across the parallel circuit

c)the current through the 10 ohm resistor

Ans: So for voltage of parallel circuit I took 180V/30 ohms = 6A. I multiplied that by 20 ohms that I had found by 1/r total = 1/30 + 1/60 = 20 ohms. So I got 120 V for voltage of the parallel circuit.

For voltage across the parallel circuit, I originally found 180V because I included the 60 V from the series. From what the tutors have said, this is the same problem as above one. Therefore, should my answer be 120 V instead of the 180V?

c) I used I = V/R = 60 V / 10 ohsm = 6 amps for the current through the 10 ohm resistor.

So I found: 120 V, 120 V again???, and 6A. Have I finally got it?

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