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Physics Class Notes: Week of October 3, 2022, Assignments of Physics

Information about homework assignments, reading materials, and exam results for a university-level physics course. It also includes explanations and diagrams related to electrical circuits, including the concepts of charge, voltage, electric field, capacitors, resistors, and current. The document also covers the topics of parallel and series resistors, and includes clicker questions to test understanding.

Typology: Assignments

Pre 2010

Uploaded on 08/08/2009

koofers-user-iwj
koofers-user-iwj 🇺🇸

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Phys. 122-02: Friday, 3 October
HW 5: Chapter 24: 14, 21, 24, and 30, and
chapter 25: 21 and 48 (due Monday).
Mastering Physics: Fourth assignment due
Tuesday.
Reading: Begin chapter 26 for Monday.
EXAM 1: has been curved since most folks
seem to have run out of time. Your actual
recorded score is 3.5 points above the raw
score (as given on the returned exam).
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Download Physics Class Notes: Week of October 3, 2022 and more Assignments Physics in PDF only on Docsity!

Phys. 122-02: Friday, 3 October

  • (^) HW 5: Chapter 24: 14, 21, 24, and 30, and chapter 25: 21 and 48 (due Monday).
  • (^) Mastering Physics: Fourth assignment due Tuesday.
  • (^) Reading: Begin chapter 26 for Monday.
  • (^) EXAM 1: has been curved since most folks seem to have run out of time. Your actual recorded score is 3.5 points above the raw score (as given on the returned exam).

The fluid (water) analogy... updated Electrical Thing  Charge  Voltage  Electric Field  Superconductor  Capacitor  Current (in a wire)  Resistor  Resistivity Fluid thing  Fluid (water)  Pressure  Pressure difference  (Unrestricted) pipe  Water tank  Current (in a pipe)  Pipe filled with sand  Density of sand

Clickers: All of the following resistors have the same resistance, and the batteries all have the same ΔV. Which network has the greatest current running through its battery? ... or (e) : (a, b, and d).

Parallel and Series Resistors In Parallel, the voltage drop across any item is always the same as each of the others. Check for uninterrupted conductors connecting each side to identify things in parallel in a circuit diagram. Parallel: 1/Req. = 1/R 1 + 1/R 2 + ... (Currents in parallel add to give the total current.) In Series, the current through each item is the same. (For capacitors, this meant the charges were equal after the capacitors became charged.) Look for a single wire broken only by the items, to identify a series network. Series: Req. = R 1 + R 2 + ... (Voltage drops in series add to give the total.)

Clickers: What is the current through the 3 Ω resistor? a) 3 Amps b) 2 Amps c) 1 Amp d) 9/8 Amp e) 0 Amps

This is the formula for the power across

anything in a circuit. It might stand for

power being lost, being stored, or being

used in some useful way.

Why ever use the BIG battery, if the small one can provide the same ΔV? The answer is internal resistance : the larger battery has less, and so it can provide more current at the same voltage.

Rule for resistors: The voltage drops in the direction of current flow! However, a charging battery has the current flowing in the opposite direction, and its terminal voltage will be larger than the open-circuit (no current) value!

A very simple series network

Kirchhoff's Loop Rule: The sum of voltage drops around any closed loop must be zero.

Example: Using Kirchhoff's circuit rules