Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [voltage-drop]

155 questions
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Basic diode question about voltage-drop

We have been begun studying diodes in electronics 1 and I have really basic question that may be really dumb but I cannot find an answer online. If a diode is in series with a resistor and a voltage source that is set at the exact forward voltage…
ModularMan
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Where does the 3 V go in this circuit?

I have a simple circuit of a DC power source (15 V) powering a DC motor. There is a voltmeter connected across the battery terminals that reads 15 V when the switch is open. When the switch is closed, the voltmeter reads 12 V. I have some…
Morris
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5 answers

Is the bigger wire section always better from the electrical point of view?

A bigger wire section is better for lowering power loss and voltage drop due to lower cable resistance. Is there any case or application where using a wider cable section is worse? (Exclude mechanical reasons)
BamsBamx
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Understanding voltage drop

Meanwhile in quarantine I been trying to learn about electronics. I am still not able to understand the voltage drop when it comes to long wires. My goal is to be able to send a 5v signal over a very long wire. I have read a lot about Ohm's law,…
Tono Nam
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6
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4 answers

Simplest way to reduce voltage from ~48v to ~36v

(I'm very much a beginner with electronics, so I apologise in advance) I’m trying to use a 48v battery on my 36v ebike controller. The controller itself can deal with the higher voltage, but it has a hardcoded limit of 44v, which it reads from a…
Tpw
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2 answers

Why do cell phone chargers drop speed when multiple devices are connected?

What are the 'limitations' that prevent a wall charger from charging multiple devices at their maximum power? Let's say I have a 4-port cell phone charger that is rated at an unknown wattage. When I connect a single phone, it charges fine. But when…
deppfx
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Solar panel voltage drops when connected to load

I have a 100 W solar panel with these specifications: Optimum operating voltage = 18.1 V Optimum operating current = 5.52 A Voc = 22.1 V Isc = 5.86 A. I connected this solar panel directly to a 100 W microinverter and connected a 33 W lamp to the…
Nur Aqmarina
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What is the voltage drop across the 10 ohm resistor?

What is the voltage drop (V1) across the 10 ohm resistor? Can I use voltage division to get V1? Like V1 = (20 V x 10 Ω) / (10 Ω + 4 Ω) But when I use nodal analysis and mesh analysis I get a different answer (12.30 V). Which one should I use? Or…
Rakshith Krish
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LED strip hot / drawing more current than expected

I am trying to wire some LED strips but they are getting a lot hotter than expected. I have noticed that they are also drawing much more current than expected. I am going to show what I've measure first as the product details seems to be…
ORBstacle
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Using resistor to drop voltage in circuit with changing current

I have no problem calculating and understanding how to drop voltage using resistor for circuits with purely resistive loads - for example look at much current will an LED draw, subtract source and LED voltage and just use Ohms law to find out the…
Lukáš Řádek
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Voltage drop across a single resistor and across two resistors

I have been having difficulty understanding voltage drops across resistors. Now, I know the theory and how to apply Ohm's law. The question is why does the voltage drop across resistors of the same resistance vary from the first circuit to the…
Cauan Kazama
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Voltage Increases when I add a load

I live in a rural area of Costa Rica. In my rented house I like to use electrical devices in the kitchen, but I always get a large voltage drop when I energize one. For instance, if I turn on my 1400 watt air fryer the voltage drops from 118v to…
Robert Shannon
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Why does the voltage drop in this circuit?

Why is the DC voltage dragged down to 0.9 V in this circuit after the speaker has beeped for a little while and has stopped? I use a DC power supply with the DC voltage set at 3 V.
ankyxia06
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Does the dropper between the catenary wire and contact wire carry current?

From my observations, droppers are of metal and they do not have any insulation from the catenary wire or from the contact wire. The catenary and contact both carry the same phase and voltage so any voltage drop that occurs in the contact wire can…
Ankit Kumar Vishwakarma
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Voltage drop on power input to four-layer PCB

I would like to preface this post by saying I have no formal education or training with electronics and am completely self-taught. I really enjoy designing home brew computers from the late 70's and early 80's as my hobby. I have made a couple in…
user302167
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