# Current and potential difference, simplifying circuit diagrams

1. Nov 1, 2007

### verytired

[SOLVED] current and potential difference, simplifying circuit diagrams

Consider the circuit shown in Figure P31.69, in which RA = 25 and RB = 7 . Tabulate the current through, and the potential difference across, each resistor.

Figure P31.69

resistor current (A) potential difference (V)
4 2 8
RA (25 ) 16/25 16
6 ?? ??
RB (7 ) ?? ??
24 ?? ??

I'm having a lot of trouble figuring this out. I know this:

V=IR

For parallel, Rtotal = R1 + R2 + ...
For series, Rtotal = (1/R1 + 1/R2+...) ^-1

Any help would be great.

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2. Nov 1, 2007

### Integral

Staff Emeritus
please clarify the meaning of your table. Specifically what do the numbers in parenthes mean?

3. Nov 1, 2007

### saket

Check the formula from your text book.

4. Nov 1, 2007

### verytired

Sorry to be unclear about the table, I didn't realize it would show up like that.
The resistor is given in the attached picture. I'm suppose to find the current and potential difference at each resistor. I've found them for the first two resistors, but I'm having trouble with the last three.

resistor --- current (A) ---- potential difference (V)
4ohms ------ 2A --------------- 8V

25ohms --- 16/25A ------------- 16V

6ohms ------- ?? --------------- ??

7ohms ------- ?? --------------- ??

24ohms ------ ?? --------------- ??