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Worksheet for General Physics III - Fall 2010 | PHY 213, Exams of Physics

Portland Community CollegePhysics

Material Type: Exam; Class: General Physics (Calculus); Subject: Physics; University: Portland Community College; Term: Summer 2009;

Typology: Exams

Pre 2010

Uploaded on 08/19/2009

koofers-user-4qi
koofers-user-4qi 🇺🇸

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Phy213: General Physics III 12/4/2020
Chapter 27 Worksheet 1
Internal Resistance
1. A real battery has a potential difference of 12V when no load is attached. A 20 load circuit
is then attached to the battery, drawing 5 W of power.
a. What is the current that flows through the
load circuit?
b. What is the potential difference across the
load circuit?
c. What is the internal resistance of the battery?
Ohm’s Law & Electrical Circuits:
2. Consider the following circuit:
a. What is the equivalent resistance
of this circuit?
b. How much total current is drawn
from the battery?
c. How much total power is drawn from the power source?
d. If the circuit is connected for 10 minutes, how much energy is drawn from the battery?
e. How much charge?
f. How many electrons?
5
10
5
+
-10
10
10
10 V
+
-Rload=20
12V
pf3
pf4
pf5

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Download Worksheet for General Physics III - Fall 2010 | PHY 213 and more Exams Physics in PDF only on Docsity!

Chapter 27 Worksheet 1 Internal Resistance

1. A real battery has a potential difference of 12V when no load is attached. A 20  load circuit

is then attached to the battery, drawing 5 W of power. a. What is the current that flows through the load circuit? b. What is the potential difference across the load circuit? c. What is the internal resistance of the battery? Ohm’s Law & Electrical Circuits:

  1. Consider the following circuit: a. What is the equivalent resistance of this circuit? b. How much total current is drawn from the battery? c. How much total power is drawn from the power source? d. If the circuit is connected for 10 minutes, how much energy is drawn from the battery? e. How much charge? f. How many electrons?

10 ^5 

+

-

10 V +

- 12V Rload=20^ 

Chapter 27 Worksheet 2

  1. Consider the following circuit: a. What is the equivalent resistance of this circuit? b. How much total current is drawn from the battery? c. How much current is flowing through each resistor? d. How much power is dissipated across resistor R?
  2. Consider the following circuit: a. What is the current through the 20  resistor? b. What is the current through the 10  resistor?

**10 V

5 V +**

-

R = 10 

20 V

Chapter 27 Worksheet 4

  1. The Hodgkin-Huxley model of the giant squid axon surface membrane is illustrated below. In this model, you will consider 2 independent and exclusive ion pathways, Na+^ and K+, respectively. The ions can only flow through their corresponding pathway. The resting (equilibrium) membrane potential (V=Vinside-Voutside) is -65 mV and the conductance per unit area of the K+^ pathway is 50 m-1/cmcm^2. a. What is the direction of Na+^ and K+^ ion flow, respectively? b. What is the net current density across the surface membrane at equilibrium? c. What is the K+^ current density? d. What is the Na+^ current density? e. Determine the conductance per unit area for the Na+^ pathway. f. Determine the resistance per unit area for each ion, RNa/cmA and RK/cmA. g. What is the charge density of the surface membrane? Hint: Treat the surface membrane as a capacitor, where the capacitance per unit surface area is 0.01 F/m^2_._

Inside

Outside

RK

VNa=67mV RNa

**-

-** VK=98mV

CM

Chapter 27 Worksheet 5 Application: The Low Pass Filter

  1. A simple filter circuit can be constructed from a resistor in series with a capacitor. An input voltage source is connected to the left side terminals and a “load circuit” is connected to the output terminals. An advantage of this circuit design is that it can resist current spikes associated with unexpected, rapid voltage jumps, which would otherwise damage the load circuit. a. What is the ratio of the input to output voltage, in terms of the filter resistance R and Rload? b. What is the necessary DC input voltage to achieve a desired output voltage of 10 V? Assume that R is 550  and Rload is 50 . c. When the filter capacitor is completely charged, how much current flows into the load circuit? d. For a voltage spike that linearly increases the input voltage by 1000V over a time of 0.001 s, what is the final voltage across the filter capacitor (0.5 F) at the top of the voltage spike? d. What is the peak current flow into the capacitor? e. What is the peak current flow into the load circuit?

Filter

RLoad

R

VK=98mV

V^ C

in V

out