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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Why do I have to increase the current by 2V when I am using a transistor?
I have a 3V 3W LED, which I would like to control with an ESP32.
For controlling the LED, I have chosen a TP122 transistor.
Here is my 'schematic': (The Arduino is an ESP in real life, and the 3 V ...
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replicating an old circuit- unexpected voltage drop [closed]
I'm fairly new to circuit design and I stumbled upon this old-fashioned 2 wire circuit everything is fine on the breadboard but I was surprised when I put it on the PCB that whenever I add R3 which I ...
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Ultra low voltage input to 12V signal [closed]
I'm making a module that’ll take input voltage from my car's electronic throttle pedal which is as low as .2V to 5V fully depressed. As soon as the module reads from .2V to 5V, it sends a 12V signal.
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Can I get the internal resistance of a capacitor from the voltage, capacity, and construction type?
I have a model of a system and I'm trying to use gradient decent to find a locally optimal solution. One of the variables is the voltage of the capacitor. I think I'll be using a film capacitor, ...
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How can I get more accurate with poisson equation finite element in this electrical field? [closed]
I am trying to use poisson equation to plot the electric scalar potential in close 2D space. The details in in this video(https://youtu.be/oPuF8v92lnc?t=854
and https://youtu.be/bLiaz-IHX_Y?t=723)
<...
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Connecting Two 24VDC Power Supplies
I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
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Tv power supply [closed]
Marks which I highlighted are not giving voltage, only backlight voltage is coming. Also no standby voltage. Please help.
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Multiple voltage source problem from Boylestead
Good day
I'm doing this problem from a textbook and I cannot understand how they got the answer. So I have to determine the voltages Va, Vb and Vab. There is a process to do this that I don't think I ...
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Prevent voltage rebound in capacitors [closed]
I have a question related to voltage rebound in capacitors.
After discharging C1, the voltage of C1 sometimes rebounds. I suspect that the circuit below might be causing this issue. Could you please ...
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How can I get 110 dB from a 10 or 15 mm piezo?
I’m trying to get the loudest sound possible out of a 10 or 15 mm piezo. I got 120 dB from a 20 mm piezo with 12 V but hoping to get the same sound from a smaller size. Any suggestions?
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Why is the power conserved in a phone charger?
Most phone chargers draw 220V 50mA (for example) from the socket to inversely proportional draw 5V and 2.2A (in its converter) to charge the phone at 2.2 A because power is conserved.
Why is power ...
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Why does a 230V 16A socket supply only the needed current to loads? [duplicate]
If I connect a 150W laptop charger to a socket that supplies at home 16A 230V, it will only draw the necessary amperage needed for the laptop charger at 230V. Why?
Why doesn't my charger simply draws ...
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Error in powergui block in Simulink involving vector dimensions [closed]
I am designing a three-phase AC source that will can step up and down 5% as required. the step up and down works with a single sine wave source but when i implemented 3 sine wave sources, i am getting ...
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Which one will turn the ceiling fan faster? Current, voltage, or power? [duplicate]
Which one of these things will turn faster the ceiling fan?
Is it the amount of electrons by unit of time passing through the engine, so is it current? Is it voltage, or is it the two that makes the ...
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Circuit that offsets input voltage to exactly 0 V
I am looking for a (op amp) circuit to offset \$f(x)= \log(x)\$ always to zero. More comprehensible is the explanation on the x-y plot below.
Basically, it is possible to offset the voltage with an ...
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