There are two questions. With each circuit, the LED forward voltage drop calculator on JSCalc-Blog.com answers two questions: How much does that light drop? What … Read More

How much power is lost as heat in an LED circuit? Where does all that energy realy go? That’s the question that stumps beginners and … Read More

This behavior of resistance through parallel circuits is unintuitive, but it’s what happens. Resistors wired in series combine linearly, just like chaining them together. Current … Read More

But engineers make trade-offs. They often try to match whatever parts are actualy available with whatever the theory says they need. In your schematic there … Read More

On paper, circuit equations is precise. You work them out, and maybe end up with 7420 ohms for a voltage divider. You might also get … Read More

Your math likely gives you a resistance that’s nearly but never exacty right. Reality is a bit messy; component shelves dont hold clean numbers like … Read More

Let’s say you pull out your motor nameplate and it says 10 amps. But what does that mean? Alone, the value mean nothing. Because you … Read More

This page turns a frequency into the exact physical size of an element in seconds using its radio antenna length calculator. A radio antenna is … Read More

How Much Does Your TV Cost to Run? With bigger and bigger screens these days, even moddern flat panel TVs use more electricity because they … Read More

Colored rings are exactly what they say they are. A 5 band resistor color code calculator will convert them into precise value of a component … Read More