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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4answers
80 views

Intuitively, why does voltage drop across a series circuit?

I'm having a really rough time intuitively grasping the basics of electricity. Taking into account that current is constant across a series circuit Using water flow analogy, suppose we have a piston ...
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1answer
43 views

Can lower than rated voltage be used on the non-control side of a relay?

For example, if I had a normally closed relay with 120 VAC control and is rated for 28VDC on the other side, could I use 3.3VDC on the 28VDC side?
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Lowest breakdown voltage diode, [on hold]

I'm looking for a diode which has the lowest forward voltage, about 1 mV or lower. I wanted to limit the signal amplitude to 1 mV. I would be very grateful for specific examples. The output impedance ...
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1answer
33 views

Calculating flashovers on hv systems

How can I calculate if there will be a flash over between a 25kv catenary and a steel bridge above the railway electrical structure?
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1answer
48 views

If I used an everyday 9v alkaline battery to power a 6v DC motor, would it work? [duplicate]

I am totally new to electronics and don't know much but am trying to create a project that uses a 29rpm 6v DC motor. I was wondering if I were to use a higher voltage battery ( a 9v battery) would it ...
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1answer
68 views

LM317 with potentiometer [on hold]

According to above equation doesn't output voltage depend on input voltage? I have made this regulator circuit but it can't increase output voltage than the input voltage. So can't we increase ...
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1answer
33 views

Electronic Circuit with Opamp and Transistor to pull down a reference voltage via a diode. (Voltage Limiting)

I have a circuit which I have designed to pull down a voltage via sinking current into the opamp output. When the source signal is of higher output impedance this works fine, but when the source ...
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4answers
151 views

Would a 9V alkaline power a 12V DC motor?

I am thinking about buying a 12V DC motor but want to keep everything, including the motor, battery, and power switch somewhat compact. I am not very knowledgeable about these kind of things and am ...
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3answers
80 views

Does a potentiometer need a resistor in series between power and ground?

I have a potentiometer I use with a circuit to get data readings. This circuit is connected to an arduino mega 2560. I was wondering if I need a resistor in series with the potentiometer? Attached are ...
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0answers
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Is there a way to save my electronic microscope which received 9V instead of 5V [closed]

I plugged in by mistake a 9V charger into my expensive :( 5V electronic microscope. (no warranty) The screen turned 100% white. But now with the correct cable 5V 1A, the screen stays black. (But the ...
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2answers
48 views

Proper voltages from same source

I'm building a small electromobile. I was planning on using a car alternator as the motor, however I'm now looking into buying a 48V 500W BLDC motor. The problem is I'm not really sure how to manage ...
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help me find the Vo please [closed]

sorry for my bad English help me find out the Vo please
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65 views

Possible causes for the introduction of a sudden bias in the spectrum of a spectrometer

I have an ultraviolet-visible spectrometer. Recently, I changed the bulb of the current light source with an identical bulb. I immediately observed a change in the shape of the spectrum which is as ...
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1answer
37 views

Wheelchair battery life calculation

Apologies because I'm sure this is an incredibly basic question and I've tried to work out the answer myself but I'm getting nowhere with it! I'm looking to get a powered trike attachment from my ...
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2answers
68 views

Resistance and wattage [closed]

I have a 6 Watt LED strip. When I turn it off it flickers briefly every 20 seconds or so. I placed a 20 Ohm, 1/4 Watt resistor in parallel across the connections to the LED strip and the flickering ...
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45 views

5V vs. 3V diode protection circuit

I'm using USB cables in an very unconventional way (don't ask, we had a barrel full of USB cables left over from something else) to connect between boards with 3v battery power and also not following ...
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1answer
27 views

Dual transient voltage supressors

I've been trying to reverse engineering a monitoring system and there's a component that I can't understand. What does these Z symbols represent?
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0answers
45 views

the output current of a voltage multiplier

i wanna build this circuit as a mosquito zapper but i'm not sure of how to calculate the output current it gives and what is the use of the resistor R1 ?
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2answers
87 views

Using a low-voltage switch in a high voltage circuit

I have an application that requires switching a circuit between the following two configurations. Circuit Lab is infuriating as it does not allow you to draw diagonal wires, so I used arrows instead. ...
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2answers
47 views

Minimum Current(not for switching) On a Relay?

I'm trying to understand how the pictured device works. It's a Sonoff WiFi controlled electrical relay. I was told that it is designed to control mains voltage only, and cannot be used to control a 5v ...
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1answer
47 views

Have I burned out my HD motor? [closed]

I accidentally cross connected my external HD and my computer power cables. Only noticed it when my computer complained it was not charging. MY HDD is no working but I have had problems with it ...
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2answers
62 views

NE555 LDR threshold voltage

The problem is that when I set the LDR on my car and stop for a short time near street lighting my headlights from the car are switched off. I made a circuit simulation, when I click 4 times for the ...
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0answers
33 views

High power source and low power load (device) [duplicate]

Can we drive low power load on high power source? For example we have source power 12 volt 60 amp and load power 12 volt 5 amp. Do we need resistor between them? If needed, what value will it be and ...
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4answers
81 views

How do I successfully connect a 3 phase motor using single phase 220 v?

I have a plastic crusher with a three phase motor and I will like to operate it using single phase 220v. Can anyone please help me out with instructions on how to connect it? Also, I want to know ...
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How to drive lcd display?

I'm trying to figure out the basics of LCD screens in practice. I found a good video which tells it needs negative and positive voltage https://youtu.be/ZP0KxZl5N2o?t=767 I want to drive just one ...
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1answer
50 views

What is the Voltage on a tablet's battery when it is turned off

Basically I tried to find out what's wrong with my broken tablet, so I used a multimeter to measure the voltage at the battery pins on the tablet's board and it was 0.1 roughly, and the transistors ...
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2answers
41 views

Series or parallel fan connection

So I wish to wire a project that uses three 12 V fans but I don't know if I should get a power supply with 12 V or 36 V.
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3answers
84 views

Voltage loss on DC circuits

I want to connect 4 bulbs in parallel. The bulbs need 12V DC and rated 18 watts. P=V*I, that means I=1.5 A on each bulb. From that the resistance of the bulbs are 8 Ohm (R=12/1.5). The circuit will ...
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1answer
34 views

How to calculate voltage-power to lower voltage-power?

I have a solar panel 18V 2W. How do I calculate how much power that is at 5V? Thank you in advance
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0answers
34 views

Voltage conversion to drive solenoid for drums

I'm new to electronics and this forum, so apologies if this is a dumb question. I'm trying to drive a solenoid from an undocumented/incomplete "Polyend Perc Pro" controller that I've got hold of, in ...
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2answers
759 views

Does this circuit have marginal voltage level problem?

As a research for the problem I described here I found this circuit by Maxim: This is clock doubler, and must be a really good fit in my case as input frequency is very well defined. However looking ...
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0answers
84 views

MOSFET not giving out full 12V

I'm using three IRLB8721 MOSFETs to power my LED strip. Through an ESP-12F I'm delivering 3.3V to each gate, which should bring me a 12V output, I think. But this doesn't work, I only get 5.8V - 7.6V (...
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1answer
30 views

What is the maximum voltage that a RJ9/RJ10/RJ22 can carry?

I want to use a 4p4c modular jack for carrying isoSPI data and 12V at <1.5A and am not sure if the connector or cable could handle that
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2answers
57 views

Find instant in which diode starts conducting in transformer full wave rectifier

We have the following circuit V2 = Vs/a; a = 10; Vs = 100sin(wt); w = 200 rad/s; Each of the diodes is modeled by a fixed 0.8 V drop when conducting, and by an open circuit when OFF. Find the ...
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2answers
95 views

Measure volt, amps, watt and kWh of an external 12 V DC system

I saw online some cheap hardware ~10$ that can measure volt, amps, watt and kWh and display the results on an LCD screen. I could buy and plug these on my 12 V solar panel system to monitor it. (5 of ...
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23 views

Amplifier Transfer Characteristics

In a previous question I had this as the given: The transfer characteristics of a voltage amplifier are described by the following equation: vO = F + G vI with amplifier saturation levels at ...
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2answers
118 views

Can I control 6-7 devices of 12v max (each) with Arduino Uno?

I have to control following devices: 2 × Gear motors (each 12V, 200mA, speed & direction) 1 × Motor (12V , 1.2 A, on / off) 1 × Motor (3V, 110mA, on / off) 1 × dc pump (...
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7answers
1k views

How do batteries connected in parallel give more current than batteries connected in series?

Let's say we have three 1V batteries and we're connecting them to a 1Ω resistor. Connected in series, the voltage is 3V and since the resistance is 1Ω, that means that from Ohm's law, the current ...
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0answers
17 views

Use of parametric file name in PWL sources

I would like to use a parametric file name for a PWL voltage source inside a subcircuit, so I can use different filenames directly from the symbol on the "top" circuit. I tried the plain PWL file={...
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1answer
40 views

Finding the sinusoidal input voltage of an amplifier

An amplifier has a linear transfer characteristic passing through the origin (0, 0) and with output voltage saturation at L+ = 10 V and L– = –8 V. The amplifier gain is 100 V/V. What is the ...
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1answer
58 views

Open drain voltage detector NCP301LSN45T1G

I have to use a voltage detector to detect a decrease in voltage to reset a microcontroller. I have found the NCP301LSN45T1G to do this. But I have a question about the Reset Output current (N-...
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3answers
62 views

220V/1ph/60Hz equipment to operate on 208V/3ph/60Hz

Can an equipment built for 220V/1ph/60 Hz be connected to a 208V/3 ph/60Hz grid by using only two lines of the 110V each across the load?
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1answer
42 views

Peltier module voltage drop

I have built the following circuit - first, I soldered together all the mt3608 components on PCB and tested it (I created DIY voltage step up module), then using jumper wires I connected the battery ...
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2answers
87 views

220v hot glue gun with Great Britain plug to be used in USA

I was mistakenly sent a 220v hot glue gun with a Great Britain plug . The plug also has a 5 amp fuse within it. Can this be used in the USA with just an adapter, or does it also need a converter/...
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1answer
37 views

Amplifier Voltage

I'm studying for my electronics exam and for this particular problem I have: Av = –85 (V/V), Ap 21 (dB) power gain, Ap = 3.41 (W/W), L+ = +9 (V), L- = -6 (V). Now the next exercise asks that: ...
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1answer
46 views

In HLW8012 schematic, where should the Referenced ground be connected

In the datasheet of HLW8012, the both 33nF capacitors , 1K resistor and 0.1uF capacitor are connected to GND. I'm not sure where should I connect those ends of components marked with GND symbol, (To ...
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1answer
72 views

How to regulate voltage across capacitors

This is a charging regulator, and with over voltage regulation across Cload, which is used to provide power for up to 3ms in case of a power micro cut. What I do understand in this schematic : How ...
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2answers
53 views

Why can a charger handle more watts at a higher voltage?

Why is it that my charger that has a rating of 100-240 volts and 1.3 amps can handle/input more watts at a higher voltage when doing the formula watts=volts x amps? In addition, why can't it, at a ...
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0answers
60 views

Low AC voltage at the socket outlet

I had my outlet damaged in my room and I attempted to do some testings of the internal connections. So I opened the screws and I did a quick visual inspection and it didn't have any problems with that....
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1answer
33 views

LED Strip - Voltage Drop when Wired in Parallel

please have a look at this chart: I have a question on the calculation of voltage drop on each of the connection point between the wire and led strip. We are using 1.5mm2 wire and 24V led strip which ...