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Finding node voltage of a “Y” resistor network
I am trying to find the voltage at NODE1. My initial approach was to find the current starting from the $15$V source then going through $R_1$ and $R_3$ to ground. Then calculating the current from...
View ArticleBest resistance for RED/BLUE 3 lead LED
I have a project where a PCB has been manufactured with an error, where a 3 lead BI color LED (red/blue) has a single resistor to limit the current for both colors. I can fix this by hacking apart the...
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Regarding the design of a basic voltage divider
I’ve just entered the fabulous world of circuitry and was wondering about the design of voltage dividers. I understand their function and formula quit well, but was wondering about the actual structure...
View ArticleWhy does an LED have a maximum voltage?
When powering a simple LED circuit (DC power source, LED, resistor), does the supply voltage matter, as long as the correctly calculated current limiting resistor value is used? In other words, is...
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How can this circuit read a value for amps at 0 volts
I made a simple circuit using this: It can tell you the voltage and current along a wire if you mouse over it. The wire down the bottom reads 4.55mA and 0V (the little yellow dots actually move to show...
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Parallel mixed with series circuit [on hold]
It has been a while since i tried something like that. I have R1 – R10 and need an algorithm to get always to Rges = 30 ohm. I thought about to use parallel connection mixed with a series circuit but...
View ArticleHow do I work out what resistor to use?
I am trying to work out what resistor to use in a circuit. The circuit is a series circuit. The power to the circuit is 5.5V, with a switch, which connects to a GPIO pin on the RasberryPi. I believe...
View ArticleIs this calculation for an optocoupler's resistor correct?
I’m trying to calculate what resistor to use for this optocoupler. Per the datasheet, it drops 1.3v at 50mA does this mean I should try choose a resistor that gives me 50mA? My supply is 3.3V so my...
View Articlebrief explanation of Ohm's law
How can I calculate ideal values of current for both short and open circuits by using Ohm’s law. Further more usually said that it is not advisable to connect DC batteries of different voltages in...
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Pull-down resistor ; why is it crucial
These 3 diagrams represent 3 test cases. Dia 1: When I perform an analogRead of analog port 0, then I get a high value obviously. According to the manual, the analogRead method obtains the resistance....
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How do I calculate voltage on a multi-powered DC circuit where all ends go to...
I’m writing software that will calculate the correct voltage on each component, given the state that the DC system is currently in (ex. what power sources are on, what relays are open, fuses popped,...
View ArticleIf adding resistors in parallel decreases total resistance, why doesn't the...
I’m sure I’m missing something basic, but here we go: If adding resistors in parallel decreases total resistance, why doesn’t the voltage in the circuit change? Does the current increase to match the...
View ArticleBasic circuit analysis question [duplicate]
This question already has an answer here: Was Benjamin Franklin wrong (about conventional current)? 2 answers
View ArticleHow does a 'voltage drop' work?
It is my understanding that, in an electric circuit, voltage is divided amongst components in a ratio determined by their various resistances. That is, for example, if a 5Ω and a10Ω resistor were...
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Calculated resistance of an LED
I am working on some circuit lab homework this week and am a bit stumped by something I just can’t seem to find anywhere in my Circuit Analysis I book. The lab has me construct the following circuit on...
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why my power calculation for this resistor is wrong?
i encountered a very simple question in a test and i easily calculated the answer but somehow i am making a mistake because i can not find my answer between the available answers, what am i doing wrong...
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Basic Circuit Analysis using Kirchhoff and Ohm's Laws
So I’m in an introductory circuit analysis class where all we have learned so far are Kirchhoff’s and Ohm’s Law. I am practicing how to solve these circuits, but for some reason I can’t understand this...
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Power consumed by an LED in a simple circuit
I am in the very beginnings of studying circuits and am a little confused on calculated Power. If I have a 9V Battery, 4 x 10k Resistors and a single LED, how would I calculate the power consumed by...
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