I try to convert ~12V signal from a car button (the input voltage can be from 10V to 14V) to a logic level signal for MCU, but the signal should to be inverted (1 = 0, 0 = 1). Below is my schema, but I'm not sure how to calculate the resistor values fo...
I have tried to use the forumla I learned along time ago to calculate the resistance required but it doesn't seem right. V/A=R. I have even looked it up on line and they tell me that if I have a 12-volt circuit requiring 0.015 amperes of current, I will need a resistor with 3...
Write down all of the information that the problem gives you. Most simple physics problems that ask you to calculate resistance give you values for current and the voltage in the problem. Convert all of the units in the problem to volts and amperes. Tricky physics teachers may give you the ...
Hello. I have some trouble understanding and calculating resistor and capacitor values for a little reflow oven proyect I am trying to make. The thing is this. I have a 700W electric oven and I am trying to control the power that goes through them with a triac diac array (the same that...
Calculate the value of the base resistor, Rb. The base resistor is the resistance measured at the base of the transistor. It's a combination of R1 and R2 as noted by the formula Rb = (R1)(R2)/(R1 + R2). Using the numbers from the previous example, the equation works as follows:...
In the user guide it says to calculate the compensation resistor (R2) using the following formula: R2 = ((Vexcite – Vcm)/Vsb)* α This would result in the following value for R2 based on K-type type thermocouple, Platinum RTD and values for Vexcite and Vcm defined in t...
The resistor values are: {eq}R_1 = 5\ \Omega {/eq} {eq}R_2 = 12\ \Omega {/eq} {eq}R_3 = 25\ \Omega {/eq} {eq}R_4 = 50\ \Omega {/eq} Step 2: Calculate the equivalent resistance using the equation {eq}\dfrac{1}{R_{eq}} = \dfrac{1}{R_1} + \dfrac{1}{...
In the course of this ongoing effort I’ve tried to produce yet another article- this one!- dedicated to one of reader’s Patrick Vaz request as to how would one can calculate the values of current, voltage, and resistance in a circuit without employing difficult to u...
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