Homework Help: Physics

Posted by Andrea on Friday, April 4, 2008 at 4:27pm.

1)Several resistors are connected in series. If a battery provides constant voltage in this circuit the addition of another resistor in series
a)increases current through each resistor
b)decreases current through each resistor
c)doesn't affect the current throught any resistor
d)doesn't affect the current throught some resistors

Isn't the correct answer B since it's in series?

2)Several resistors are connected in series. If a battery provides constant voltage in this circuit the addition of another resistor in series
a)increases voltage through each resistor
b)decreases voltage through each resistor
c)doesn't affect the voltage across any resistor
d)doesn't affect the voltage across some resistors

Isn't it A? V=IR and as R increases V also increases.

Physics - drwls, Friday, April 4, 2008 at 4:55pm
1) B You are right
2) B The total voltage across the whole series circuit is the same, so there is less voltage drop in each resistor.

For each resistor, I goes down and R stays the same.
Physics - bobpursley, Friday, April 4, 2008 at 4:55pm
One is correct. On the second, b would be a great answer if it read "decreases voltage across each resistor. Adding a resistor decreases total current, so (V=IR) means the voltage across the resistors decreases.

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