Together they act as a low-pass filter that will filter out the high-frequency components of a signal. The name refers to the two components in the circuit: a resistor (R) and a capacitor (C). Now let’s go for something a bit more interesting and usable, say, an RC circuit. Let’s look at the current in the resistor: I can now query the simulation object for all variables and parameters. Let’s see how SystemModeler handles this. You’d also learn Ohm’s law, stating that I = V/R, so with a potential of 10 volts and a resistance of 5 ohms, we get a current of 2 amperes. This circuit is something that you would build in middle school (at least I did), with the resistor replaced with a small light bulb. To create this circuit, I used drag-and-drop from the built-in components that come with SystemModeler. I named it HelloSystemModeler in the tradition of computer language tutorials, where most first simple programs usually start with a greeting like “Hello, world.” This circuit only contains three components: a resistor, a voltage source (like an ideal battery), and a ground. Let’s start with the simplest electrical circuit I can think of: It’s also available with a student license, or you can buy a home-use license. If you want to follow along, you can download a trial of SystemModeler. In this blog post, I’ll start from very basic circuits with components such as resistors and inductors and gradually add more complexity in the form of amplifiers and switching circuits. With SystemModeler I think it’s easier than ever to get started building virtual circuits and trying what-if scenarios for electrical circuits and systems. In my first circuits class, all calculations were done by hand, and we could check solutions with unintuitive circuit simulators using the SPICE methodology. Explore the contents of this article with a free Wolfram SystemModeler trial.
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