CK-12-Physics-Concepts - Intermediate

19.1. Series Circuits http://www.ck12.org

• IT=I 1 =I 2 =I 3

• RT=R 1 +R 2 +R 3

Practice

Questions

The following video is on series circuits. Use this resource to answer the questions that follow.

http://www.youtube.com/watch?v=qO391knBRjE

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/63605

1. How do the voltage drops across the two light bulbs in the video related to the total voltage drop for the entire
   circuit?


2. In the video, what was the assumed voltage drop for the connecting wires and the switch?


3. What was the current through the second light bulb as compared to the current through the first light bulb.

Review

Questions

1. There are three 20.0Ωresistors connected in series across a 120 V generator.
   (a) What is the total resistance of the circuit?
   (b) What is the current in the circuit?
   (c) What is the voltage drop across one of the resistors?


2. A 5.00Ω, a 10.0Ω, and a 15.0Ωresistor are connected in a series across a 90.0 V battery.
   (a) What is the equivalent resistance of the circuit?
   (b) What is the current in the circuit?
   (c) What is the voltage drop across the 5.00Ωresistor?


3. A 5.00Ωand a 10.0Ωresistor are connected in series across an unknown voltage. The total current in the
   circuit is 3.00 A.
   (a) What is the equivalent resistance of the circuit?
   (b) What is the current through the 5.00Ωresistor?
   (c) What is the total voltage drop for the entire circuit?

• series circuit:One in which all of the current must pass through every resistor in the circuit.