Homework Help: physics

Posted by okay on Monday, March 14, 2011 at 2:33pm.

8. The current in a simple series circuit is 5 amp. When an additional resistance of 2 ohms is inserted in series, the current drops to 4 amp. What is the resistance of the original circuit?

physics - bobpursley, Monday, March 14, 2011 at 3:03pm
V/r=5
V/(r+2)=3

V=5r
V=3r+6

5r=3r+6
r=3

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