![]() Parallel and series resistor calculators are essential tools for anyone working with electronic circuits. Educational purposes (e.g., teaching and learning about resistor networks).Component selection for specific resistance values.These resistor calculators are valuable tools for professionals and hobbyists alike. Conversion between different units (e.g., ohms, kilohms, or megaohms)Īpplications of Parallel and Series Resistor Calculators.Options for selecting parallel or series configuration.User-friendly interfaces for entering resistor values.These calculators generally include the following features: Parallel and series resistor calculators are designed to provide quick and accurate results for resistor networks. How Parallel and Series Resistor Calculators Work This is where parallel and series resistor calculators come into play, offering valuable benefits such as: Manual calculations can be tedious, time-consuming, and error-prone, particularly when dealing with multiple resistors or complex circuits. + Rn The Need for Parallel and Series Resistor Calculators You could add a resistor with a really low resistance in certain places of the circuit to make the current want to go there instead.R_total = R1 + R2 +. You could add a resistor with a really high resistance in certain places of the circuit to make the current want to go somewhere else. Let's say he adds another 1 Ohm resistor in parallel- now each resistor gets 1/4 the total current. They would each get 1/3 of the total current. Let's say all the resistors in his example were 1 Ohm. You asked if more resistors are added, would there be less current to go around. All of the circuit elements are practically touching each other.ģ. This is because this is an ideal circuit where the wiring has absolutely no resistance. As long as the "A" side of the element and the "B" side of the element touch the "A" and "B" node respectively, you can redraw this diagram ANYWAY you want. Mark each side of your circuit elements "A" and "B" as well. Name the top node "A" and the bottom node "B". There are only two nodes in that diagram, see his previous lesson on this. Same voltage, but could be different current depending on the resistances.Ģ. ![]() One slide may be steeper than the other (so water flows down more easily, it has less resistance) but they start at the same height on the cliff. ![]() Think of the wires as a water slide down the cliff. Think of voltage as the height of a cliff. Things that are in parallel have the same voltage. This is one of the most fundamentally important concepts in Electrical Engineering, and there are a few things to be learned from this:ġ. If you switched those two resistors absolutely nothing would be different. As beginning engineers, current sources are not familiar because they are buried inside integrated circuits.Ĭurrent wants to "get away" from resistance, so the lower your resistance, the more current will pass through. Most transistors (MOSFET, Bipolar) and the old vacuum tubes have a region of operation where they act just like a current source. If you change the resistor to 1000 ohms, the current will still be 1 mA and the voltage generated by the current source will rise to V = 1 mA x 1000 ohms = 1 V. If you connect a 100 ohm resistor across the current source, the voltage will be V = 1 mA x 100 ohms = 0.1 V. Example: suppose you have a constant current source set to current = 1 mA. Depending on what it is connected to, a current source provides whatever voltage is needed to keep the current on its terminals constant. When you put a current source in a circuit, the current through the source is always a constant value. A constant current source is designed to generate a controlled current. If you change the resistor to 10 ohms, the voltage will still be 1.5 V but the voltage source will now generate a current of 1.5/10 = 150 mA.Ĭurrent sources may seem a little strange, but they behave exactly like a voltage source, but with current being controlled. Example: a 1.5 V battery connected to a 100 ohm resistor will generate a current of 1.5/100 = 15 mA. ![]() Depending on what it is connected to, a voltage source provides (generates) whatever current is needed to keep the voltage on its terminals constant. When you put a constant voltage source in a circuit, the voltage across its terminals is always a constant value. The difference between them lies in which parameter (voltage or current) is being controlled.Ī constant voltage source (like a battery) is designed to generate a controlled voltage. Voltage and current sources generate both voltage and current.
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