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Results tagged with power
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user 46343
Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (one joule per second). Use this tag where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.
10
votes
Accepted
What happens to excess energy fed into the power grid?
These results will be obtained regardless of what causes the "excess energy" on the grid (lightning, solar installations, wind power, etc.). …
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2
votes
Voltage drop on Solar Cell MPPT
It seems that initially you used a different transistor but now you replaced it with the same one. However, you said nothing about removing R12? The point is that if your circuit is not identical to …
- 2,516
1
vote
Accepted
How can a USB cable extender boost the signal without an external power source?
The key term is no external power. It does use some internal power to boost the signal. In addition to the signal wires, there is also a ground and +5V wires in the USB cable. …
- 2,516
1
vote
Device power requirements
You are correct on the math, however designing for the max current could be a more expensive design than necessary. For example, if you are not going to have more than two devices charging, and each …
- 2,516
1
vote
Design for portable PV charging for 97 Wh lithium-ion battery
The power from the panel can go 1) through a "charger" that produces 24V DC @ 2A, or 2) through an "inverter" that produces 120V AC @ 2A. … The advantage of option 2) is that you can plug your device just like you normally do (wall plug), but is less power efficient. …
- 2,516
0
votes
What can I put a kilowatt into? (Or: help me save my hairdryers)
I looked up the specs for your battery. There is one serious difference. The spec calls for a constant discharge rate of 10C, not a continuous discharge rate of 10C. What this means is that you can …
- 2,516
0
votes
SCR in this circuit exploded - why?
I believe that the problem is that you are applying a "non-isolated" ground to the bottom lead of the SCR, applying the full voltage across the SCR, causing a huge current to flow through it, causing …
- 2,516
0
votes
Why are thyristor stacks hung from the ceiling?
I believe it is done for safety reasons. Since high voltage is involved, in the event the stack hits the ground, there would be an arc to ground, causing sparks, heat and possible explosions. By "ha …
- 2,516
0
votes
How to prevent a voltage drop when a motor turns on?
This means using a power supply/battery for each motor. This way you can turn each motor on or off, without affecting the other motor. …
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Why aren’t the main conductors in this underground power cable made from copper?
An additional possible consideration is the contribution of the "skin effect." Because of the "skin effect" it matters little that aluminum is not as good a conductor as copper. However, since alumi …
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-1
votes
Does Armature current decrease as the load decreases?
So, to double the power (full load), the voltage and current have to be increased by the square root of 2 $$ 2^{1/2} x \ 2^{1/2} = 2$$
In the event that the coils are not connected in parallel and the … voltage is to remain the same, then the current on the armature has to double, to provide the necessary power (ignoring losses). …
- 2,516