Questions tagged [voltage]

Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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LC tank circuit behavior

Today in our lesson we did the LC tank circuit and its natural response frequency.I get how the equations work but what I didn't get is a qualitative explanation of what's going on.I mean why does the ...
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What's the RMS voltage of this asymmetric rectangle function?

I recorded this asymmetric rectangle function: I calculated the RMS voltage to be equal to the amplitude (4,10 V in this case) However when I measured this exact signal with a TrueRMS multimeter, it ...
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What are the possible reasons this current transformer doesn't work?

On the assembly shown, I have built a current transformer with a toroid coiled with 30 turns of magnet wire. The brown wire is the phase going through, blue is neutral. When I connect a fan onto the ...
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50 views

Drop voltage of a doorbell transformer

I am trying to install a video doorbell that requires an 18-24VAC supply voltage. The existing doorbell is supplying 28V. How can I use a resistor to drop the voltage down to something below 24VAC so ...
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97 views

The effect of grounding a simple circuit?

Suppose I have a simple DC circuit consisting of a battery of voltage V (no internal resistance assumed), and a resistor (resistance R) connected in series by conducting wires. Because the wires are ...
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32 views

Using Quickfield LabelMover to extract specific local values at coordinates

Quickfield Student Edition I've attempted using Quickfield's LabelMover Serial Analysis to automatically get local values of interest at a set of different specific coordinates, but I couldn't find a ...
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3answers
72 views

Lowering various input voltages by 1 volt

Step-down buck converters like this one lowers various input voltages to a fixed voltage. For example 12V/9V/6V to 3V. But is there way to lower various input voltages by 1 volt, that is, 12V to 11V, ...
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139 views

Resistors in a transistor circuit [duplicate]

I am not an electrical engineer but I was just reading the book - The art of electronics. I am just a bit confused about how to analyze this amplifier circuit. In this case, why are R1 and R2 in ...
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33 views

Inductor under variable voltage source

In order to understand a tank circuit , I need to understand how inductors behave under differential voltage(discharging capacitor).I know inductors in AC behave like resistors but I don't know how ...
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Please help me with this question [closed]

Figure shows a diode setup for a specific circuitry. Solve UF and the relevant current flows IDA, IDB and IR for the following conditions: i. UA = 10V and UB = 0V ii. UA = 6V and UB = 5.8V
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Forward voltage of a diode

I hope you could help me with this question. Why would the voltage drop only by 0.2V when the forward voltage of this diode is 0.8V. The Zener diode voltage is 10V Thanks.
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How do I calculate the discharge time of a battery with a step-down converter?

I'm building a battery to drive a small 12V motor which is rated to draw max 7A. The battery has the following stats: Nominal voltage: 14.4V Capacity: 20.4Ah So I calculated that the energy should ...
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54 views

Microcontroller States

I'm using this S23K142 Microcontroller - 64 pins. I just want to know (in general as well as with respect to this microcontroller) how many states does this Microcontroller have? By states I mean, ...
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AC parallel and series circuit

I have this AC circuit: simulate this circuit – Schematic created using CircuitLab I have found VA which is \$222 \angle-119 mV\$. The current flowing through the inductor \$IL = 2.6 \angle-89 ...
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1answer
68 views

Microcontroller pin out configuration upon power up

I have this S32K142 microcontroller, in the 64 pin package. I have 2 SPI interfaces, 1 I2C interface, 2 UART interfaces, 6 ADC inputs, a few GPIO and PWM output requirements. My question: On initial ...
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3answers
78 views

Where is the electric field in an \$LC\$ circuit?

Suppose we have an ideal \$LC\$ circuit with an open switch at time \$t=0\$ where the capacitor is initially charged to a voltage \$V\$. The instant the switch is closed, the typical \$LC\$ ...
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1answer
45 views

Bench power supply - Inconsistent voltage output

It's been 3 years since I first bought my bench power supply, a Long wei LW-K3010D. This issue has reoccured to me a couple of months ago, but it usually "went away" when the PSU was ...
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2answers
54 views

Large voltage drop across source terminal

I am using an N-channel MOSFET to enable another IC. My gate voltage=1V, the drain voltage=3.3V. After rigging up the circuit, the voltage across EN_DC23 was measured with reference to ground and it ...
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1answer
70 views

Convert a voltage from 0-12V into a resistance from 0-264 ohm

I have a fuel sender that works on 12V and sends the reading to the engine. The engine wont start with it disconnected (hence the diode). What I need is to copy the resistance of the fuel sender using ...
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1answer
51 views

What happens to the windings on a transformer during tap changing?

I'm trying to figure out what the windings do when a tap change occurs on a power transformer. The picture below is my understanding of how tap changing occurs when there is an increase in load on the ...
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1answer
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AC circuit voltages and currents

I have this circuit: Have I done everything correctly? I cannot find my mistake. Help appreciated.
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1answer
24 views

Thermal voltage of Ge diode

What is the thermal voltage of a Ge diode?I know for a silicon diode is about 26mV at room temperature. I have this circuit: simulate this circuit – Schematic created using CircuitLab and a set ...
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40 views

opamp single supply output AC (audio) voltage limit

I build non-inverting op amp with single supply voltage cca 9V. The basic scheme is shown in the figure below: How to limit output AC signal if the base DC voltage is at half the supply voltage 4.5 V ...
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What is the right BMS and S/P configoration [closed]

the cells are 3.2 volt at 280ah buy 32 cells what is the best 12/24/28v and the best BMS for setup I have all ready purchaced cells and am waiting on delivery to install in my rv
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Does my total power supply voltage need to equal the sum of the voltages in my circuit in series?

If I have let’s say, 4 bulbs, each rated at 1.5 volts and they’re all connected in series. Would my battery need to be rated 6 volts? My logic is that each bulb would have a voltage drop of 1.5 volts ...
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What is the flow of current with two parallel voltage sources? [closed]

Good day ! I am a physics student and not an EE so I'm quite hesitant with approaching this circuit problem. What will be the equations for this analysis? Will their be current in the red line even ...
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60 views

Circuits with diodes shockley equation

I am using the Shockley model to evaluate the current through a diode and the voltage across it and I have this circuit and this is where I am stuck: simulate this circuit – Schematic created ...
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1answer
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Formula of ideal diode for dc load line analysis

There is a formula when solving diode circuits with load line analysis which is not the Shockley diode equation but looks like it and it is exponential this is what i can remember about it I am ...
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2answers
55 views

AC circuit capacitor voltage drop

Suppose we have this circuit: simulate this circuit – Schematic created using CircuitLab Z = 4-3j I = V/Z = 1<0/5<36 = 0.2< -36 A But when I use Ohm's law on the capacitor i get this ...
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2answers
85 views

Search for the most efficient voltage regulator on low current consumption

I'm currently designing a circuit for a long term device that will consume 1-2mA at 3.3V constantly. The system is run with a default lithium polymer battery and I need to get as much time out of it ...
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1answer
33 views

Deactivating RF modulator circuit, should I cut off the supply voltage as well?

I asked a qeustion about this mod I'm doing to my Amiga 1200, but unfortunately I asked two questions at once, and only one question got answered. This is about removing an RF modulator from the ...
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1answer
78 views

Isn't conventional current supposed to go from high potential to low potential ? If yes, then why this rule is not respected in opamp using AC?

First, thank you for reading my post. I'm a beginner in electronics. I learned that conventional current goes from high potential to low potential. It has always worked for me in DC and even AC. But ...
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1answer
85 views

What is the exact meaning of 0.7V voltage drop in a forward-biased diode?

this question is partially (but not totally) discussed here: Why do diodes have a voltage drop? Does the power drop on a diode become entirely heat? The conclusion is that, in a forward-biased diode ...
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35 views

Questions about COBs and power supplies from a beginner

I'm planning to use Citizen 1212 COBs, but I don't know how they can be used on 70 watt for each one of them, knowing that each unit will have 5 COBs. So my question is: what is the right power supply ...
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1answer
45 views

Deactivating RF modulator circuit in an Amiga 1200, minimum required parts to remove, worrying about composite video voltage

I'm currently doing some work on the PCB of my old Amiga 1200. In order to play some games I want to revive it by installing a scandoubler/flickerixer that I bought to basically be able to connect it ...
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26 views

DC motor related problem [closed]

I am designing a micromachining setup for which I need to supply voltage to the spindle of the dc motor. Will the motor damage if we apply a DC source to the spindle?
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2answers
54 views

Understanding stepper motor voltage and torque relationship

The specs of this Stepper Motor say at a voltage of 3.36 V and phase current 2.1 A, the maximum holding torque is 65Ncm. I'm confused though as on the datasheet there is no voltage mentioned, only a ...
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4answers
62 views

Understanding power ratings

So my previous question here confirmed what I thought, to calculate the power dissipated in a component, take the voltage across the device and multiply by the current. But why do some devices have a ...
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2answers
91 views

How do you input the voltage signal to an oscilloscope?

I was watching this tutorial on "analyzing actual Ethernet encoding" https://www.youtube.com/watch?v=i8CmibhvZ0c&ab_channel=BenEater Orange pair is transmitting data to the oscilloscope ...
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1answer
61 views

Input and Output Voltage of a Full bridge rectifier

I know If we provide a sinusoidal AC Voltage across the Inputs of a full bridge rectifier we get a fluctuating DC Voltage (more or less) with the peaks of source AC Voltage. But what would be the peak ...
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48 views

Two phone batteries connected in series not working

I have two, fully charged, 3.7V standard Nokia phone batteries, that I want to connect together to use as a 7.4V battery, I connected the (+) of one to the (-) of the other, and then tested it but it ...
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Modes of operation of P-JFET

I have the conditions of the operation of the N-JFET But I can't understand how we can find the expressions for the P-JFET.Are they opposite?Help appreciated
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2answers
37 views

Understanding Negative feedback loop circuit with an Ideal Op-Amp

The following is given as an example of a negative feedback loop in my textbook, note that the op-amp is assumed to be ideal. However I do not seem to understand the logic behind this acting as a ...
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1answer
99 views

ESD protection diode required for 1.8V processor pin [closed]

I need ESD diode protection for 1.8V processor pin and its absolute max. voltage is 2V. I searched various parts but not available in this 1.8V of ESD protection. So does anyone use the same kind of ...
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2answers
53 views

Input Ripple Voltage and Output Ripple Voltage for Capacitors

I'm working with Buck converters and Boost converters separately. Can someone tell me the reason why the output ripple voltage (and current) exists in the Output Capacitors and how does the input ...
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3answers
355 views

Is it necessary to connect relay contact at voltage zero?

While disconnecting relay contact, it is recommended that the action should be done at or near current zero. As the contact area decreases rapidly, a spark is generated due to high current density. ...
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50 views

JFET question about operation

I have a question about the N-JFET.Assume it operates at the linear region and it acts like a voltage controlled resistor. Can we say that if Vdg(drain-gate voltage) is increased then the resistance ...
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1answer
106 views

Reduce 2.503V regulated voltage by just about 3mV

I have a handful of REF192GP reference voltage sources. They are specified to produce a relatively precise 2.5V. Measuring each device I typically get a few mV higher than 2.5V, for example 2.503V. ...
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1answer
69 views

Is powering a 12v DC motor with 11.1 volts a bad idea? (3 * 18560 battaries)

I am working on an Arduino project where I will be controlling 4 individual 12 volt, 0.71 Nominal amp draw DC motors, the arduino will be separately powered with another power supply. I'm going to use ...
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1answer
61 views

H-bridge made of MOSFETs

If we have an H-bridge made of 4 N-MOSFETs, the gate voltage applied to each pair must be different because in an active circuit the sources will have different voltages. How much?

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