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- What exactly is voltage? - Electrical Engineering Stack Exchange
The total voltage you get from one out and back, even with a high temperature difference is pretty small By putting many of these out and back combinations together, you can get a useful voltage A single out and back is called a thermocouple, and can be used to sense temperature Many together is a thermocouple generator Yes, those actually
- How are current and voltage related to torque and speed of a brushless . . .
Voltage instead "regulates" how fast a motor can run: the maximum speed a motor can reach is the speed at which the motor generates a voltage (named "Counter-electromotive force") which is equal to the voltage it receives from battery (disregarding power losses and frictions for simplicity)
- What, exactly, is voltage? - Electrical Engineering Stack Exchange
And also if voltage is like gravitational potential energy, how does more voltage mean more current? And here our nice analogy breaks down In this sense voltage is more like pressure in a water pipe
- Why did current increase when voltage decreased?
At a lower voltage, you need more current to provide the same power So any device that is designed to provide the same power regardless of voltage will draw more current as the voltage drops
- What is forward and reverse voltage when working with diodes?
The reverse voltage is the voltage drop across the diode if the voltage at the cathode is more positive than the voltage at the anode (if you connect + to the cathode) This is usually much higher than the forward voltage As with forward voltage, a current will flow if the connected voltage exceeds this value This is called a "breakdown"
- Can a current source have a voltage across it?
A current source can certainly have a voltage across it If the voltage across a current source is zero, then it is not delivering or absorbing any power However, if the voltage across the source is not zero, then it is either sourcing or sinking power into the rest of the circuit
- Why does a resistor reduce voltage if V=IR? [duplicate]
According to Ohm's law, resistance varies directly with voltage You should read this the other way Voltage varies directly with current "R" is the constant of proportionality telling how much it varies If I add in a resistor to a circuit, the voltage decreases If you have a resistor in a circuit, with a current flowing through it, there will be a voltage dropped across the resistor (as
- voltage - Easy way to figure out a LEDs Vf in order to pick an . . .
Either way: The voltage through a series circuit will be distributed through all the elements in the circuit Let's assume a very simple circuit with a red LED, a resistor and the supply If the meter indicated 1 2V Vf for the LED, you know your resistor will have to drop 5V - 1 2V or 3 8V
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