Videos tagged physics
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PY106 pre-class video for session 23 - Waves
In this video, we'll start talking about waves. This is our first introduction to the topic - we'll do a lot more on waves in upcoming videos. This time, we'll talk about transverse and longitudinal waves, and then we'll look at the equation we use [...]to describe a single-frequency transverse traveling wave. Finally, we'll wrap up the video by looking at how we measure wavelength and period.
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Magnetic Fields - 02/23/2011
Prof. Andrew Duffy, PHY106, Feb 23 2011
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PY106 pre-class video for session 20 - Faraday's law, and the flux vs. time graph
This is another relatively short video, focused on the connection between induced current and the flux vs. time graph. By working with Faraday's law and Ohm's law, we will look at the various pieces of information you can extract from such a graph, [...]including how to compare the magnitude of the induced current at different times; how to get information about the direction of the induced current; and how to do a calculation of the magnitude of the induced current at a particular instant in time.
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PY106 pre-class video for session 12 - Kirchoff's rules
In this video, we cover the loop rule and the junction rule, which are collectively known as Kirchoff's rules. The junction rule states that the sum of all the currents coming into any point in a circuit is equal to the sum of all the currents going [...]away from that point. The loop rule states that the sum of all the potential differences around a complete loop in a circuit is zero. We will make use of these rules to calculate the current in a circuit that has one battery and three resistors. Note that we again make use of the Circuit Construction Kit Phet simulation from the University of Colorado, available at http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc
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PY106 pre-class video for session 10 - Resistors in parallel; resistors in series
We begin this video with a discussion of electric power, and discuss how you go about calculating how much an electrical device costs to run. We then go through the derivation of the equation to calculate the equivalent resistance of resistors in [...]parallel, as well as a similar derivation to find the equation for the equivalent resistance of resistors in series. For both resistors in parallel and resistors in series, we look at an animation of the process, and also discuss the relevant ski-hill analogy. Note that these animations use the circuit construction kit simulation, which is one of the Phet simulations from the University of Colorado. The link to that simulation is http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc
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PY106 pre-class video for session 9 - Current, batteries, and resistance
In this video, we start talking about the basic building blocks of electric circuits. We will define current, and go through how a battery works. We will also talk about resistance, and Ohm's law, which connects voltage, current, and resistance. The [...]movie wraps up with an introduction to a ski-hill analogy for an electric circuit.
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PY106 pre-class video for session 8 - Capacitors
In this video, we talk about various issues related to capacitors, which are devices that can store electric charge (and, because they store charge, they store electrical energy, too). Our focus will be on the parallel-plate capacitor, which you can [...]make by connecting two cookie sheets to a battery. We'll talk about the capacitance of a parallel-plate capacitor; the electric field between the capacitor plates; the energy stored in the capacitor; and the effect of adding a dielectric (a piece of insulating material) to the space between the plates. Note that the simulation that was used to generate the animations used in the movie is available in Chapter 17 at the Essential Physics web site, located at http://physics.bu.edu/~duffy/EssentialPhysics/
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PY106 pre-class video for session 6 - Electric potential
In this video, we will discuss electric potential. Note that electric potential is not the same thing as electric potential energy, although they are closely related. Once again, we'll learn by analogy with gravity, as equipotentials (lines of [...]constant potential) are just as useful to us are contour lines on a map are to a hiker. We'll look at the connection between electric potential and electric field, and we'll also look at the connection between electric potential and electric potential energy.
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PY106 pre-class video for session 5 - Electric potential energy
In this video, we talk about electric potential energy. We'll start off discussing potential energy in a uniform field, and then move on to talk about potential energy of pairs of interacting charges. In each case, we'll draw on what we learned from [...]gravity and see how to apply that knowledge to charged objects interacting with electric fields, or with other charged objects. We'll wrap things up by calculating the electric potential energy of a set of point charges.
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