# 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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### How to connect 2 hot wire to a 2 pole MCB? [migrated]

how can i connect 2 hot wires to a 2 pole MCB? What is the output of 2 pole MCB ? Will it be the same as 2 hot wire output or can connect to a LIVE and NEUTRAL terminal?
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### Requirements for closed, open, and short circuits

In terms of understanding paths in a circuit, let's take a few example circuits: (1) Would the following circuit be considered closed or open (or something else) since it doesn't have a voltage ...
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### Inductive Crankshaft Position Sensor Voltage Drop When Split Between Inputs

I'm working on a project with a vehicle using two engine control modules, which both need accurate crankshaft position signals to function. Adding a second sensor is not an option. The sensor is an ...
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### Should a grounded case have voltage across it?

Ok so simple question though it might seem stupid. I'm wiring up a simple metal enclosure with a control unit inside. AC current from the wall, 240v~ to the unit. I'm containing it in a metal case ...
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### SMPS Input/Output ripple current and ripple voltage

I found a presentation regarding SMPS and found this slide. I am not totally able to grasp the concept of the input and output ripple current. In the above image I have the following questions : I ...
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### How do we find where the average voltage resistor load formula came from?

Applying the half wave rectifier. We have in series a source called $V_{in}$, a diode and the resistor load. To find the average resistor load we use this formula : $(V_{max} - 0.7) / \pi$ I ...
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### Multimeter capacitance value - ADC readings

I have set up my raspberry pi to read from the MAX1204. To know if I'm reading the proper value, I use a multimeter at the input channel of the ADC, and compare it to what I read through my program. ...
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### Linear regulator heats up at 60 volts

MY goal is to design a regulator which could receive (12 V to 60 volts DC as an input) and 5 volt with 60 to 70 mA current as an output. The reason I used three BJT's NPN (Q1, Q2, Q3), so I thought I ...
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### What supply voltage for the Abracon crystal oscillators?

I'm considering the Abracon ABM8W-13.5600MHZ-4-B1U-T3 Crystal but I'm having difficulty finding the maximum and minimum supply voltages. Does anybody know how to obtain this information (I've tried ...
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### Why does voltage sign matter for electrical devices and components

If you look at the specifications for certain electrical devices, computer hard drives for instance, the voltage requirements would be something like +6.6v or +12v. Why does the sign matter? Why ...
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### How long will a 32v 15A (500Wh) e-bike battery last outputting at 5V 1A?

I hope it's okay to ask this here My e-bike has a Lithium Ion battery (32 Volts, 15 Amps), and it has a USB-A output, marked as 5V and 1A, I have 3 questions: How long will this battery last while ...
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### How to find voltage across a capacitor?

I was given this problem in a basic engineering circuit analysis class. I really don't know where to start.
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### DC Current Density and Voltage in a Finite-Length Conductor

Assume you have a rectangular bar of copper with finite length L. You apply a voltage difference at two points on the top surface of the bar; (x1,y1) and (x2,y2). Because the bar is finite in length,...
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### How to calculate voltage of these nodes

How exactly does one calculate the voltage of the marked nodes and arrive at the numbers in the picture (1.75 and 1.628)? I fail when trying. :( simulate this circuit – Schematic created using ...
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### How to use Millman's theorem to solve this question:find the voltage value

The question wants me to calculate the Vc simulate this circuit – Schematic created using CircuitLab And here is my thinking: These arrows are the current flowing direction i think,and i ...
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### Determine the voltage across the 5.0-Ω resistor in the drawing

I have tried to solve this problem but I haven't seen a dc circuit with a battery on the shared portion so I don't know how to include the 2.0 volt battery in the circuit rules. Please help
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### If I have a device drawing 300mA @5V and I need to use a 15V PSU what current rating do I need for the PSU?

I have an application with multiple components and multiple voltages in use and current calculations are giving me a headache. A simplified version of my application would include: 1x device ...
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### Design a passive amplifier

I am trying to increase the amplitude of my generated electrical signal by a passive amplifier. I have seen so many complex RLC circuits. But I have limited space for design, therefore, can I use a ...
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### Why do some SMPS power supplies require an input voltage select switch?

I have 2 SMPS power supplies near me. One is an ATX power supply, the other is for a 3d printer. They both are rated for 110-240v in, but the ATX supply can handle the full range automatically, while ...
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### Using an Audio Signal for a Control Voltage for an Analog Synthesizer

I have a Moog Sub 37 Analog Synthesizer and a Korg SV-1 keyboard. Can I take the audio out of either the line outs or headphone out of the Korg and plug it into the volume or filter Control Voltage (...
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### A simple voltage divider problem

I came across a rather simple looking circuit of a voltage divider circuit. It has 5V at one terminal and 0V at the other terminal. Let's start by connecting two 1K resistors in series between these ...
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### Output current of LM338T

I tried voltage regulator using LM338T. It is okay to regulate the voltage but when I measured the output current it gives me around 1.5 amperes, not more than that. But datasheet specified it can ...
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### For the network shown in the figure, draw the corresponding Thévenin equivalent circuit and establish its parameters VT and RT

I can't find any examples online similar to this format, please help! Attempt: RT = (2*5)/(2+5) = 10/7 = 1.429 k-ohms VT = 8V + 8V = 16 V Do you ignore the center resistor and just add the voltages ...
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### 3.3v input in a 1.8v logic question

In a board design there's a mistake in the voltage level to control a reset pin (Signal RESETB). It should be 1.8v but it is driven by a 3.3v level. The datasheet shows the next info: It looks like ...
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### Can I use these wires for AC current? [closed]

I bought these wires on amazon, and I noticed in the description that they are rated for 80 volts, and are specifically not to be used for household 110v/220v wiring. However, this wire is basically ...
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### Understanding lower voltage’s effects

Let’s say I have a surge protector that has a 15A cable that is rated 1875 watts at 125V. If my voltage is low, let’s say 105V the amount of watts it can supply will drop? So its max safe output ...
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### Why do I need 2 resistors to divide voltage?

I know someone else asked the same question, but I wasn't able to understand it. My question is, why do you need 2 resistors (1 to ground), to divide the voltage? Just 1 resistor would do the same ...
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### Calculating total voltage/current for 3-phase?

Consider I have a 3-phase generator with the following measurements: Phase 1 (A): 22.8828A Phase 2 (A): 22.9922A Phase 3 (A): 22.9219A Phase 1 (V): 239.7656V Phase 2 (V): 241.8594V Phase 3 (V): 245....
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### Just not sure - USB/Charging Pad [duplicate]

I have a "wireless" charging pad that is 5v 2a and I can't find a plug that matches the amperage. I have a 5v1a, 6v 800ma, 5v 250ma, and a 5v 500ma, so what can I use to make sure that it's not ...
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### Why does current change when adding in an LED?

In the following diagram: The current is 1 mA from: V = IR R = 1 / 1000 = 1 mA However, when I add in an LED with forward voltage 1V: Why does adding in the ...
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### Circuit with a voltmeter across a resistor

Can someone please answer this question? Consider the circuit where the voltmeter read 2.8V across a resistor. Which of these statements is definitely correct? Each electron transfers 2.8J of ...
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### Reasoning behind equations in analysis of electrical circuit

I am currently studying the mathematics textbook Nonlinear Dynamics and Chaos by Strogatz. As part of an example, I am provided with the following electrical circuit and accompanying explanation: ...
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### How to calculate voltage and current of this circuit?

I already know the answer of question 1, 2 and 3. 1) 448 ohm 2) 1.6 V 3) 0.13 V About the question 4, why 6V/300 = 0.02A = 20mA is wrong? Can I use current divider like 0.01339 * (3.3 * 10^3 / (...
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### Finding Node Voltage

I need to find node voltage at A. This seems like a trivial question, but when I set up the resistive voltage divider equations they are not equal to each other. Am I doing something wrong? My ...
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### Can a switching power supply kill you?

I'm curious about one thing. Can a switching power supply with 24V - 4.5A output can kill you if you touch its outputs directly? As I know, just a 100mA may kill you too, so is it safe to use ...
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### PWM disables charging battery after heavy load on inverter

I have 2 batteries 12V 80Ah deep cycle lead in series for a 24V system. I connected an invertor directly to the battery pack. I have ~600W (~44V) of solar panels connected to the PWM charge ...
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### solving circuit using mesh equations

Im trying to solve this circuit.I think ive got something wrong because the results are a little different than what i was expecting.Any help would be very much apreciated.Ive got this so far. -20 + ...