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Results tagged with voltage
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user 740
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).
6
votes
What is negative voltage?
To say you have a voltage of +5V at point A means that point A is 5 volts more positive than your chosen ground. … To say you have a voltage of -5V at point B means that 'ground' is 5 volts more positive than point B.
The sign just tells you the polarity of the voltage, with respect to the ground node. …
- 19.3k
1
vote
Simple voltage divider question
When a voltage is 'taken' at a single point, this is just short-hand for measuring relative to a reference point. The convention is to refer to that reference point as 'ground'. … Therefore, it is fair to say that the voltage at Vout is the voltage across R1. …
- 19.3k
4
votes
Charging devices - Voltage and Amperage
A better one, with protection will reduce its output voltage to keep the current constant, in which case, due to the reduced voltage, your device won't charge much faster than in the first case. …
- 19.3k
31
votes
High-voltage capacitor in a low-voltage system
No, having a higher rated cap will not somehow store up more voltage than is available in the circuit. … You actually want a cap with a slightly higher voltage rating than the highest voltage you expect to put across it. …
- 19.3k
5
votes
Transistor with two voltage levels, Vb ≠ Vcc
Sounds like the load you're driving is floating the emitter voltage up to where the signal from the arduino can't really completely saturate the transistor. …
- 19.3k
1
vote
Voltage drops and current for LED?
The short answer:
The current will not be 0.05A simply because the spec for the supply says 0.05A; when a power supply spec provides a current, that's just the maximum you should try to take from it …
- 19.3k
4
votes
Need help operating a transistor
The collector-emitter drop should either be the full supply voltage in the OFF state, or something around 0.2V in the ON state. If not, resistor values should be changed. …
- 19.3k