# E7 - Phy sics 7B WS E7(rev 3.0 Page 1 E-7 DC Circuits...

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Physics 7B WS E7 (rev. 3.0) Page 1 E-7. DC Circuits Questions for discussion 1 . The figure below shows a cutaway view of two current-carrying wires, a thick one and a thin one. In the thick wire, electrons are moving with a speed of 3 cm/sec. In the thin wire, electrons are moving faster, with a speed of 5 cm/sec. Let both wires have the same electron density (the number of electrons per unit volume) be ρ . a) First consider the thick wire. In one second, how many electrons will pass a given point in the wire? b) Next consider the thin wire. In one second, how many electrons will pass a given point in this wire? c) Which wire carries the greater current? d) What are the numerical values of the two currents, in amps? 2 . In the circuit shown below, what is the value of the missing current? In which direction does it flow?

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WS E7 (rev. 3.0) Page 2 3 . Voltmeters have been attached to the following circuit, in order to ascertain voltages between various points. a) What is the voltage ε of the battery on the left? b)
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## This note was uploaded on 11/19/2010 for the course LECTURE 1 taught by Professor Yildiz during the Fall '10 term at Berkeley.

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E7 - Phy sics 7B WS E7(rev 3.0 Page 1 E-7 DC Circuits...

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