All Questions
Tagged with resistance dc
42
questions
0
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2
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Multimeter not picking up a resistance
I am making a set of speakers using 34.5 AWG magnet wire, and neodymium magnets to make a voice coil.
For my wire gauge and required length I should have ~3 Ω (DC), 4 Ω (AC).
The issue is when I ...
-2
votes
2
answers
352
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How to remove 50 Hz, 100mV noise? [closed]
I am getting 100 mV noise signal at 50 Hz. I do not know the origin of the noise. What should I need to do to remove it?
- 69
1
vote
1
answer
145
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Resistors in series and parallel conundrum
Three resistors of some resistance (ohms) are put in series and the measured total resistance is 24 ohm. Now, if the same three resistors are connected in parallel to each other and the total ...
- 13
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votes
1
answer
2k
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Power absorbed by load resistor
Can someone double-check where's the mistake? The system didn't accept my answer.
TASK: Find the maximum power absorbed by the load resistor, knowing that:
$$E = 6.6V; R_{1} = 12.1Ω; R_{2} = 14Ω; R_{...
- 179
11
votes
7
answers
2k
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Is there any difference between transferring DC over one 36 mm² wire or six 6 mm² wires?
I am designing an off-grid DIY solar power site where the distance between the solar panels and inverter is going to be several dozen meters, so I would prefer to put a thicker wire to minimize losses....
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3
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7k
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Where is the resistance in a starter motor circuit?
In a car or motorcycle, the starter motor is switched by a relay. The relay coil is switched by a key switch or small pushbutton. All of it is a 12 volt DC system.
Is it correct to think of the relay ...
- 103
4
votes
2
answers
1k
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Why do batteries only have resistance one way?
I initially had this question because I was playing around with brine electrolysis and I found that the resistance is 0 one way (positive in negative cell) and infinite the other way (positive in ...
- 59
1
vote
1
answer
868
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Tapping into a 4 AWG wire
I am part of a hobby project where we have a pair of fat, insulated #4 AWG stranded copper wires carrying +5V and ground. I want to tap into these wires every few inches to draw power off it (max draw ...
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2
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303
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i have a question about the analogy between Hydraulic system and Electrical system
In Hydraulic system the Pump out oil "" flow "" , It doesn't out pressure , well what create the pressure is the " restriction " or "" orifice "" or "" resistance "" .
In Electrical system , The ...
- 1
1
vote
2
answers
112
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Resistance of electronic circuits
I am currently trying to build a Regulated DC Power Supply for an electronic piano. I am trying to find the minimum capacitance that I need to able to reach the desired ripple voltage. To find my ...
- 137
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2
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10k
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Is the resistance in a DC Motor constant if the voltage is?
Is resistance in a DC motor constant if both the load and voltage are constant as well?
- 25
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2
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Calculated resistance of an LED [duplicate]
I am working on some circuit lab homework this week and am a bit stumped by something I just can't seem to find anywhere in my Circuit Analysis I book.
The lab has me construct the following circuit ...
-2
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2
answers
344
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Problem with resistance,electric circuit etc. etc.
In which way a resistance is to be connected with a bulb labelled 120W-60V when it is connected with 220V DC source so that maximum illumination with proper security is maintained? What is the ...
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-2
votes
1
answer
700
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is it possible to connect ac power source to battery in parallel connection ?
Is it possible to connect ac power source & a battery in a parallel connection where a battery is low voltage & have current more then the internal resistance of circuit ?
As the battery is ...
- 1
0
votes
2
answers
963
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Calculating voltage in a simple circuit
If I had a 12V battery and wanted to use an LED that used 2V and 20mA, then I need a resistor that will drop 10V and provide enough resistance to produce a current of 20mA.
Therefore I would use R=V/I ...
- 345