Videos tagged py106
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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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PY106 pre-class video for session 4 - More electric field
In this video, we'll talk some more about the electric field. We'll look at the motion of charged particles in a uniform electric field. After that, we'll talk some more about the connection between the force a charged particle experiences, and the [...]electric field at the location of the particle (the field because of other nearby charged particles, for instance). Finally, we'll introduce the concept of a test charge, and do an example in which we use the known force experienced by a test charge to find the sign and magnitude of a nearby charge.
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PY106 pre-class video for session 3 - The electric field
In this video, we motivate the idea of the electric field, which is one measure of the way a charged object influences the region around it. It sounds abstract and complicated, until you realize that the electric field, E, is for charge what the [...]gravitational field, g, is for mass. Note that g is often referred to as the acceleration due to gravity, but "gravitational field" is a fine name for it. The video covers an example, compares g and E a little, and then shows some field line pictures and equivalent field vector pictures. Don't be intimidated by those, though - just remember that whatever we did with g will work with E, too.
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PY106 pre-class video for session 2 - Coulomb's law
In this video, we go over Coulomb's law, which allows us to calculate the force that one charged object exerts on a second charged object. The equation describing this interaction between charged objects has the same form as Newton's universal law of [...]gravitation, so we'll discuss the parallels between objects with mass, interacting through the gravitational force, and objects with charge, interacting through the electrostatic force. Finally, we'll go over a small example that involves the application of Coulomb's law.
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