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Physics 261
Capacitors
Introduction
Capacitors, a pair of conductors separated by a dielectric (insulator), store charge (or equivalently,
the energy required to form an electric eld between the conductors). The quantity of charge Q
stored depends on th
Physics 261
Simple Resistor-Capacitor Circuits
Having investigated both capacitors and resistors, as well as simple DC resistor circuits, you will
now look at circuits with both resistors and capacitors. In particular, you will test the equation that
desc
Physics 261
Simple Series Resistor Circuits
Resistors
Resistors come in many shapes and forms, related to power capacity, precision, and cost. This lab
will employ low-cost, carbon composite resistors.
Resistor power ratings are roughly proportional to th
PHYS261
Spring 2011
Quiz Solutions
1. (a) I A = 7.61 mA, A = 0.11 mA, I A = 0.04 mA
I B = 7.6 mA, B = 0.7 mA, I B = 0.2 mA
(b) RA = 7.61 0.04 mA
RB = 7.6 0.2 mA
(c) A: |87.61|/0.04 10 standard deviations away, so not in agreement
B: |8 7.6|/0.2 2 standard
Introduction to TDS 1012 Digital Oscilloscope
This laboratory exercise is designed as a brief overview of the features of the TDS 1012 digital oscilloscope. The oscilloscope has long been one of the most important tools in any physics or electronics labor
Physics 261
Simple Parallel Resistor Circuits
Consider the following three ciruits (note that each placement of the ammeter is a separate
circuit):
In terms of the labels, R1 and R2 , calculate the total resistance, RT . In terms of R1 and R2 and
their u
Physics 261
Electric Field Mapping
An electric eld is a vector eld, having both magnitude and direction. Its magnitude is proportional to the force felt by a unit positive charge, and its direction is the direction of this force. Motion
of a charged objec
Physics 261
Magnetic Fields
The magnetic eld of a perfect solenoid is directed, according to a right-hand rule, along the axis
of the solenoid with a magnitude, derived with Amperes Law, of
B = nI
(1)
where B is the eld magnitude, is the magnetic permeabi
Data Analysis
From PHYS 161, you should have learned1 :
1. Quantitative scientic statements include appropriately precise numerical
values, uncertainties of matching precision, and units to identify what in
fact the numbers refer to.
2. The number of deci
PHYS261
Traditional Lab
LR Circuit
In a driven circuit made up of an inductor (L) with internal resistance r and
a resistor (R), the total resistance is r + R, and the inductive reactance is
XL = L, where is 2f , and f is the driving frequency of a genera
Physics 261
Half-Life of an LR Circuit
A circuit made up of an inductor and a resistor in series with one another and a wave generator
will behave similarly to an RC circuit. Denoting the combined resistance of the inductor and the
resistor as R then a Ki
Physics 261
Kirchhos Laws in DC Circuits
Kirchhos Laws apply conservation of energy and conservation of electric charge to DC circuits:
the sum of the potential energy dierences across all elements of a closed circuit is zero (Kirchhos
voltage or loop rul
Physics 261
Standing Waves on a String
Waves can be described in terms of the following parameters [see Figure 1]:
Amplitude, A
Wavelength,
Period, T
Propagation speed, v
Figure 1: Position and time plots of a sinusoidal representation of a one-dimen