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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43 views

Gain Bandwidth Product on an op-amp

Just wanted to ask how the GBW of an op-amp affects its operation. If I am given a 2 Op-Amps with different GBWs, do I choose the one with higher or lower and why?
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Saturated voltage of LF351 op-amp

So the LF351 has an output voltage swing of typically 12V. To achieve an undistorted output waveform, output swing should be lower than Vsat. How do I know what the Vsat is? Its not mentioned anywhere ...
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Routine Tests on Motor

I was going through the standards related to motor testing that are IS 12615, IS 15999-1, IS 15999-2-1 while reviewing a motor with requirements of 3phase induction motor, 1500rpm, 120hp, 415V and ...
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Generate a voltage that is 7 volts below the input voltage for at least 250 mA in the range of 20-26 volts

For programming bipolar ROMs I need a programming voltage of U=27V,30V,33V and an input voltage of U-7V. My first idea was to use a Zener diode in series to drop 7V at the diode. However, the needed ...
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Electrical circuits homework

I am pretty new to circuits analysis and I have the following problem as homework: ig2(t) = 4sin(ωt + π/4), e3(t) = 12sin(ωt + π/4), R1 = 10 Ω, ωL1 = 4 Ω, ωL3 = 3 Ω, 1/(ωC2) = 6 Ω I have to calculate ...
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49 views

Drop input voltage for a boost converter

I have a 21V DC solar panel power source, that feeds a DC-DC boost converter. I set the output voltage of the boost converter to 19.5V to charge my laptop, but since the input voltage is higher than ...
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Overvolting brushed motors by 0.2V

For RC models, I own several brushed motors which are intended to operate at 7,2V. According to my previous tests, they usually take 25 amps, 30 being the absolute maximum. To divide by two the weight ...
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I need help with determining voltage wave form of LM317

Now I calculated Vout as being 5V, so is the Vout wave form the same as Vin?
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Computing the voltage drop across a resistor in a complex circuit? [closed]

For example, how would one compute the voltage across R4 in the circuit below? The original question: as in the given figure the voltage across 5 ohm resistance is ...
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29 views

Computing Voltage Drops in an AC Circuit

Compute for the theoretical voltages across the resistor and inductor for 10 kHz in polar form. (1.23 kΩ, 5 V RMS, 3.3 mH.) I don't know where did I go wrong, my answer is very far from the data that ...
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Did I Kill My Laptop? [closed]

My laptop takes a 19V adapter but I accidentally plugged in a 12V adapter and the laptop started smoking. I unplugged it after about a second. I read that if the polarity is correct and the voltage is ...
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How to prevent the fluctuation of LEDs due to motor and music with loud bass?

I have a 12V DC power supply/battery supplying a class D audio amplifier, 12V DC linear actuator (controlled by Raspberry Pi through an H-bridge,) LCD screen and LED light strip (lighting intensity ...
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What is the best instrument amplifier to measure microvolt dc signals from a low impedance differential type T thermocouple system? [closed]

I wish to measure 0.02 C difference between two type T thermocouple junctions with accuracy. I need only 1Hz bandwidth. I am looking for small changes in temperature in this apparatus.
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Locating shorted component when nothing gets hot

I'm working on water damaged DJI Osmo Action. I've noticed one power rail is shorted to ground. Caps connected to this line are shorted and the coil also shows full short to ground. I tried using ...
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1answer
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resistor selection for TPS3700DDCR undervoltage circuit

I am designing an undervoltage circuit for a lipo battery project. I found this tutorial here which lead me to the TPS3700. I am wanting the undervoltage condition to be 3 volts. The part that I am ...
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3answers
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How to estimate the temperature of a filament?

I would like to know how I can estimate/calculate the temperature of a heated filament. For example, the filament (rhenium) is 0.2mm in diameter and heated with a voltage of 6.4V and a current of 2....
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Low voltage (self-oscillating) boost for solar powered pond pump

Long story shortened: I am currently designing a small filter for my pond using a small pump (6V-12V, upto 540mA) with UV-C LEDs parallel to it. Currently, it is battery powered (9V, 6x1.5V AA cells) ...
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Boost Voltage from 5V to 19.1 V

Long story short, I have a Toshiba laptop. Its adapter outputs 19.05 volt and 3A. I wanted to build a powerbank for my laptop. I have built one using Li-ion cells. 5 cells in series with each cell as ...
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66 views

Calculate the needed mAh to heat a flat coil for at least 2 hours [closed]

First of all, I want to let you know that I am very new to this profession. That's why I am asking you kindly to not use any profession related words, because I have very difficulties in understanding ...
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Voltage divider with 2 Input

Can you help me solve the below circuit with formula, I have 2 voltage source for a voltage divider and what is the output voltage and can u elaborate with formula
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25 views

Charging iPhone XR with 5.3v charger

I currently have a Samsung charger rated at 5.3v/2A. I tested it and it is actually 5.35v (used a multimeter). I'm planning to buy an iPhone XR, but the standard charger Apple offers is rated at 5v/1A....
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How to intentionally overload almost any value resistor with a DC power supply?

When attaching a resistor to my power supply (which is a Extech 80W 3-in-1 Switching DC Power Supply, capable of 36V 5A) and the amps are set to let’s say 5A at 16V the voltage stays the same but the ...
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Voltage divider with 2 voltage source formula [closed]

can anyone solve this equation. 5v connected to R1-10k(top resistor). 3.3v is connected to R2(5k) bottom resistor so what is the output voltage of that voltage divider
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Voltage calculation from RF rigid line directional wattmeter

I have a question about voltage calculation from RF rigid line directional wattmeter. I have a device like below: We tested it under 1kW coming from transmitter. Schema like this: || Transmitter(1kW) ...
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74 views

How do I calculate the root mean square voltage of a square wave (with drawing)?

I need to find the root mean square voltage based on this drawing, knowing that the period (T) is equal to 6 seconds, and the voltage (V) is equal to 14 Volt. I know that the rms can be calculated ...
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Mini PC received higher voltage (19V instead of 12v) what hap

It was dark behind my desk and I've plugged in the wrong cable 19 V, 3amp instead of the dedicated 12 V, 3amp. The 19V adapter ...
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2answers
38 views

calculating voltage or current for a plain transistor (no resistor)

the short version of my question is this: how do you know what the current through a transistor will be if there are no resistors? I am reading mostly the second edition of the Art of Electronics, ...
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1answer
77 views

What sort of device plugs in to this outlet?

I am looking to buy a window air conditioner. I would like the get the most powerful air conditioner my electrical system can support. I have this plug on my wall: I have never seen this plug before, ...
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op amp - current source - voltage output

I have the electronic schematic bellow composed with two op amp and I want to determine the voltage output of the X2 op Amp. I m a little bit confusing about the aim of using the zener diode D1 in ...
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1answer
45 views

Problems finding voltage between two points (transistor)

I am having a homework question about transistors where I am asked to find the voltage drop between the base and the collector (Vbc). I drew the circuit in Proteus but I am not sure where to put the ...
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1answer
24 views

Microcontroller Vol Maximum Voltage compatibility

I am having this microcontroller - S32K142 64 pins - 5V Core voltage I have the below RESET signal connection which is provided by the MCU to the below transistor (which provides RESET to another ...
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3answers
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Applying kirchoffs law in a simple circuit

Can we apply Kirchhoff's volatge law in this simple circuit and say V1=-r1I1 and V2=r2I2 or is there an other connection between voltages and currents?
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Art of Electronics 2.5 - Transistor saturation

With reference to the image below the text says When the switch is closed, the base rises to 0.6 V (base– emitter diode is in forward conduction). The drop across the base resistor is 9.4 V, so the ...
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1answer
68 views

Is a solid state relay with over 1 MHz driving frequency physically possible?

I could only find one question semi-relatable to mine on SE, but I have a more demanding application in mind. I have designed a 32 stage 40 VAC -> 1000 VDC Cockroft-Walton voltage multiplier which ...
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31 views

Need an isolator or similar to fix my design issue

I have an arrangement where 0-80 VDC signal is provided as input to a measurement board for measuring this DC signal. But somehow along with this 80 VDC signal, there is noise coming in the circuit ...
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2answers
47 views

Combine voltage sources [closed]

I have a Baldor DG6E generator. It must produce 120V/240V but I bought it and it has three wires as outlets - every one produces 120V. I want to combine two wires to produce 240V. How can I combine ...
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1answer
79 views

How do I find the voltage across the capacitor?

The circuit which is shown above has no resistance. So there is no time constant. Plus the current source has no resistance in parallel. So I cant convert it into voltage source. Is there any way to ...
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3answers
102 views

Voltage / current from Van De Graff generator vs. voltage / current from AC wall sockets in homes

The Van De Graff generator can generate voltages in the kV and MV range. I have read that if I touch the Van De Graff generator producing, say 50kV, with one hand (myself being insulated from ground ...
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Battery Discharged - But Potential difference exists without any current flow

My below question is regarding batteries. I have a USB charger and a mobile battery (Li-ion battery). So, my mobile battery percentage has dropped to 0%. So, what I do now - Take the USB Charger. Plug ...
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0answers
39 views

What is the process behind the forming of a low voltage electrical arc?

I am trying to understand the exact process undertaken when forming a low voltage high current electrical arc, such as in a welding scenario. My understanding at present is that without a high voltage,...
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41 views

Voltage rating of 3.5mm jack audio output

I am building an audio amplifier using TDA2030. I want to know what is voltage (RMS or peak-peak) rating of typical audio output from 3.5mm jack. I am doing a simulation in Proteus, and I am having ...
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5answers
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Does the voltage difference have an effect on the electrons' speed? [duplicate]

If voltage means the pressure that makes the electrons move from the negative side to the positive one doesn't that mean that the more the voltage there is the faster the electrons move? But the ...
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Resistance measured low in constant DC voltage supply

I have a DC power supply, which I have connected to an electrical circuit on a breadboard whose total or equivalent resistance is to be measured. The power supply comes with a voltage and current ...
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1answer
26 views

How do I pick a suitable battery for my sensor?

I'm very new to electronics, and I have a sensor which is being powered by 2 batteries in series, each 6V/3.5Ah. I believe this means the total Watt Hours is 6x3.5x2 = 42Wh. When the sensor started, ...
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Allegro ACS71020 Reinforced Isolation

Based on the diagram on the datasheet, I don't see that the AC line voltage measurement circuit is reinforced isolation. Resistor dividers can't be reinforced isolation circuits as my understanding. ...
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2answers
69 views

Which one is more dangerous to human body among high voltage or current and their AC and DC versions?

I have already gone through many similar questions but none seems to quench my thirst to know. Take the example two different sources A and B, as - A = 1000 V & 1A B = 1 V & 1000A Note - ...
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Damaged Power Supply from USB 3.5'' External Drive Enclosure

I have a 3.5'' External Hard Drive Enclosure. Recently it stopped working. When I connected the power supply and turned it on I could hear the disk spinning but after about 1-2 seconds the disk stops ...
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3answers
137 views

Which Source of Energy Comes First?

When there are multiple sources of power, how is it determined which one is used? or are they all split? Easy example is a grid tied solar system. If you have grid power in a breaker box and also ...
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2answers
80 views

Settling time in 2nd order response (circuit)

I understand the definition of settling time defined as "time took to reach within +-2% (or 5) of the converged value". Then does it mean settling time cannot be defined when the response converges to ...
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1answer
59 views

Surge protector for car USB port

OK so the car manual says not to stick items into the car's USB port while starting the car. Like any good engineer(ing student) I tried to see what will happen if I did so, and am now the proud owner ...

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