# hw5sols - MasteringPhysics 2/27/08 1:48 PM Assignment...

This preview shows pages 1–4. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2/27/08 1:48 PM MasteringPhysics Page 2 of 14 http://session.masteringphysics.com/myct Resistance and Wire Length Description: Cut a long resistor of known resistance into n identical shorter resistors. Find the resistance of the short resistors reconnected in parallel. You have been given a long length of wire. You measure the resistance of the wire, and find it to be . You then cut the wire into identical pieces . Part A If you connect the pieces in parallel as shown , what is the total resistance of the wires connected in parallel? Part A.1 Find the resistance of the wire segments A wire's resistance is proportional to its length. Find the resistance of each of the short segments of wire. Hint A.1.a Formula for the resistance of a wire The formula for the resistance of a wire in terms of its length and cross-sectional area is , where is the resistivity of the material of the wire. ANSWER: = Part A.2 Resistors in parallel For resistors in parallel of resistance for , the total resistance can be determined from the equality
2/27/08 1:48 PM MasteringPhysics Page 3 of 14 http://session.masteringphysics.com/myct . If all resistors have the same resistance , what is the total resistance of the parallel resistors? Express your answer in terms of and . ANSWER: = Express your answer in terms of and . ANSWER: = Battery, Ammeter, and Resistors Description: Apply Kirchhoff's loop law to several series circuits containing 0, 1, or 2 identical resistors. An ammeter is connected in series to a battery of voltage and a resistor of unknown resistance . The ammeter reads a current . Next, a resistor of unknown resistance is connected in series to the ammeter, and the ammeter's reading drops to . Finally, a second resistor, also of resistance , is connected in series as well. Now the ammeter

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## hw5sols - MasteringPhysics 2/27/08 1:48 PM Assignment...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online