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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Calculate Required Voltage/Power/Watts/Amps needed to for a device
I am a Mechanical Engineer looking to construct a portable electronic device from the ground up, I am seeking assistance with the electrical aspects due to my basic circuitry knowledge.
At this stage, ...
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Using a Relay to control an irrigation valve solenoid
I'm using a JQC-FC3VDC relay. I control it from a microscontroller using a 3.3V signal through an opto-link. And the business end of the relay controls a 24VAC output which then activates the ...
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Can a voltage higher than LED maximum be used when using constant-current LED driver?
I am planning to use these components:
TLC59283
CREE J Series 5630 LEDs
Specifically, I want to create a setup like Figure 9-1 on pg. 22 of the TLC59283 datasheet. Currently, I am trying to choose a ...
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Is a capacitor a memoryless system?
According to my textbook,
A system is said to be memoryless if its output for each value of the independent variable at a given time is dependent on the input at only that same time.
It also gives ...
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What makes a MCU capable of higher temps than another?
Just an example - STM32F722 has a few versions, but I'm talking about just the variance between two numbers: RET6 vs RET7. The former has a max operating temp of 85C, whereas the latter says 105C. ...
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5V on DP and DM pins on FT232RL?
Can I apply 5 volts to the DP and DM pins of the FT232RL, given that the technical sheet says that the maximum voltage of these pins is up to 3.8 volts?
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Getting 12 V from original 20 V of PSU in Vintage Arcade Cabinet
I have an old Italian Arcade Cabinet which is a clone of Atari Scramble. The game name is Explorer and was made by sidam. I am in the process of adapting this pre jamma cab to jamma so to use a ...
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Why does IPC 2221 require so much more spacing at elevation?
In the IPC 2221 is a table that specifies the required trace spacing. One thing that I find very surprising is the jump once the elevation is above 3050m. E.g. For an external conductor (uncoated) at ...
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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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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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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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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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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 ...
