When were you last exposed to an electrostatic discharge?
So I saw the discharge create an arc and my finger tingled for minutes.
LifePo4 BMS for outdoor project?
Hello, I'm currently building an outdoor project with an ESP32 and a few sensors. I'm using small 5V solar panels for this (as planned) and would like to build a buffer out of LiFePO4 batteries because they are cycle-resistant and temperature-resistant; they are generally very safe. The only problem is that I can't find a…
Physics Calculate time constant of capacitor?
Hello, I have to do the following problem in physics (picture). We discussed it in class, but unfortunately I didn't write anything down. Could someone please tell me how to calculate it? I'm mainly interested in problem a). If you can, it would be great if you could tell me how to calculate it using…
Electric shock from keyboard?
I have a Razer Blackwidow Mini and have been using it for a year. I suddenly got a strong electric shock. I touched the cable and nothing happened. I touched the keyboard again to press a key and it hit me hard. What could be causing this and how can I fix it?
Force static charge?
Hello, I'm wondering how you can force a static charge, so that you shake someone's hand and then they get an electric shock
Static discharge when plugging in a cell phone cable?
I just plugged my phone charger into the wall outlet, and when I plugged in the wall adapter, I felt a small shock on my hand. It tingled slightly for a moment, but otherwise I'm fine. I have two small chars in the skin on my hand where it entered, as well as on my…
Physics exercise?
I'm currently studying for my physics paper. I can't find an approach to this task. I just know that applies , but I only entered t. Can someone help me? The thunderstorm begins. Calculate the (average) current that would flow in a lightning flash of duration t = 0.27 s, assuming that it discharges the…
Logarithmize initial voltage by voltage after 7 ms?
If you want to calculate the resistance R of a discharged capacitor, you have to calculate -t / (C * (ln (U(t)/U0)). t is 7 ms = 0.007 s U (t) = 260 V Since the voltage drops to 25% => 0.25 * 260 = 65 V. C is 35 µF = 35 * 10^6…
Lithium-ion battery reaction equations?
hey, In our textbook there are these 2 reaction equations: Could someone explain this to me? I can't find any connection. and also which reactions are oxidation or reduction and why. would be super nice. thanks in advance!
Charge BMW E46 key with induction pad?
Hi, I have a pretty big problem and haven't been able to get into my E46 for three weeks. The following: The car is rarely used, and therefore the FFB in the key became increasingly unreliable. In winter, it often stopped working altogether, so I often had to manually open the frozen lock. Two years…
Question about the power bank?
Hello, I bought the RealPower Pb-20K. And I have two questions you might be able to help me with. The first is: is it bad if you discharge the power bank to 0%? Unfortunately, that happened to me. I thought it still had enough juice to charge my phone. Then I checked at some point…