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Results tagged with voltage
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user 104897
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).
2
votes
Why can't high current substitute low voltage
Consider using the water in pluming metaphor to explain voltage and current. … Using this metaphor, the voltage is the pressure in the pluming and the current is the amount of water making it through the pluming. Batteries become water pumps. …
- 3,539
3
votes
Adding DC offset to a given input
Such a circuit can relocate the upper or lower extreme of a waveform to a predetermined voltage level. …
- 3,539
0
votes
Accepted
Timing delay is random for SPI write - read command
The assumption is that an application which access the SPI port is running on a Linux operating system. Linux is a real time operating system. As such, it is not reasonable to expect the application …
- 3,539
0
votes
Voltage drop across capacitor in a DC circuit? (Simple question)
You wrote:
V=0*R
(Therefore Voltage is zero.)
And assumed this was the voltage at the node between the resistor and the capacitor. In fact, this is the voltage drop across the resistor. … You are actually proving the voltage is the same with respect to ground on either side of the resistor. Which is what you would expect if using an fully charged ideal capacitor. …
- 3,539
2
votes
Accepted
Do resistors limit voltage, or reduce it?
When they do this, a voltage difference is developed across the resistor.
LED are usually characterized by the amount of voltage & current they need in order to light up. … So when calculating which resistor is needed for a given constant voltage power supply, say 5 volts, and given LED which requires, say, 3.3 volts, you subtract 3.3 from 5 and get 1.7. …
- 3,539
1
vote
How would current flow in a resistor in this case?
Some find it easier to understand electronics using physical world metaphors:
Consider the voltage source as a water pump which produces 9 pounds per square inch pressure. … So, in this metaphor:
The water pressure is the voltage (V).
The water flow is the current (I).
The constriction in the pipe is the resistance (R). …
- 3,539
0
votes
How to determine voltage across LEDs in a circuit?
Consider not calculating the LED voltage drops. Instead get the forward bias LED voltage drops and current requirements from the LED specifications. … Only then pick the appropriate series resistance based on the needed voltage drop from the power source to the desired voltage at the LED using the specified LED current. …
- 3,539
2
votes
Convert a 0 V / 3.3 V trigger signal into a 0 V / 5V trigger signal (TTL)
Question: Is there an off-the-self electronic solution to convert a 0 / 3.3 trigger into a 0 / 5 trigger signal ?
Yes, it is called a level shifter and is commonly used for sending data between logi …
- 3,539
0
votes
jumper wires better for VCC or ground?
This is a case of best practices rather that a completely right or wrong way of routing power to parts on a PCB. The best way is to have a multi layer board and using power planes with thermal relief …
- 3,539
2
votes
Powering 2.8v LED string off ESP8266 board's 3.3v pin
You can not make a voltage divider without taking into account the load current. … Since the LEDs were not as bright as expected, it is assumed the voltage was measured across the voltage divider before connecting the string of 50 white LEDs? …
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