Physics Question Help resistance and voltage?

Handiman · #1 (**permalink**) 03-23-2008, 08:51 PM

Two resistors A and B are connected in paral-
lel across a 12V battery. The current through
B is found to be 1.8A. When the two resistors
are connected in series to the 12 V battery,
a voltmeter connected across resistor A mea-
sures a voltage of 7.6V.
Find the resistance of B. Answer in units of ohms
*.

TheKacler · #2 (**permalink**) 03-23-2008, 08:52 PM

You can solve with info gained from parallel connection.

Rb = Vb / Ib = 12V / 1.8A
Rb = 6.66... Ohms (The sign of the beast?)

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