PhysicsLAB CP Workbook
Series Circuits

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In the circuit shown at the right, a voltage of 6 V pushes charge through a single resistor of 2 W. According to Ohm's law, the current in the resistor, and therefore in the whole circuit, is  ____ A. 

If a second identical lamp is added, as on the left, the 6-V battery must push charge through a total resistance of  ___ ohms. 

The current in the circuit is then ___ A. 

The equivalent resistance of three 4-ohm resistors in series is ___ ohm(s). 

Does current flow through a resistor or across a resistor?
Is voltage established through a resistor or across a resistor?
Does current in the lamps occur simultaneously, or does charge flow first through one lamp, then the other, and finally the last in turn?
Refer to the following information for the next seven questions.

Circuits a and b below are identical with all bulbs rated at equal wattage and therefore equal resistance. The only difference between the circuits is that Bulb 5 has a short circuit, as shown.
In which circuit is the current greater?
In which circuit are all three bulbs equally bright?
In which circuit are the bulbs the brightest?
When both circuits are operating, which bulb(s) is(are) the dimmest?
What bulbs have the largest voltage drops across them?
Which circuit dissipates more power?
What circuit produces more light?

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