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I have a question about direction of vectoral line integral in formula of electric potential and electric field. In electrostatic I assumed \$B\$ is positive potential and \$A\$ is negative potential so the boundary of the integral is negative to positive and also there is a minus sign outside the integral, and also \$d\ell\$ direction […]

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I have a question about direction of vectoral line integral in formula of electric potential and electric field. In electrostatic I assumed \$B\$ is positive potential and \$A\$ is negative potential so the boundary of the integral is negative to positive and also there is a minus sign outside the integral, and also \$d\ell\$ direction […]

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I have a question about direction of vectoral line integral in formula of electric potential and electric field. In electrostatic I assumed \$B\$ is positive potential and \$A\$ is negative potential so the boundary of the integral is negative to positive and also there is a minus sign outside the integral, and also \$d\ell\$ direction […]

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## I’m an electrical idiot – can you help me?

I have overhead doors at the back of my office building. I wanted to wire up a large red LED next to the light switch so that when employees leave, the light would be red indicating the doors are up. I purchased a step down transformer of some sort that reduces the voltage to 6 […]

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## How can I generate a sinusoidal waveform of n cycles? [closed]

How can I generate a sinusoidal waveform of n cycles, 50 Hertz frequency and incorporate the respective changes in sine waveform as per PQ events allotted below: Phenomena: Transient; Category: impulse; Sub-category: Micro-second; Typical Spectral Content: 1 us rise; Typical duration: 50 ns – 1 ms;

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## How to control an E9001 Servo

I bought an E9001 servo on Amazon (which was my first mistake, but it was cheap- see link) to use in a robotics project, but I can’t figure out how to use it, and I cannot find any formal documentation for it. https://www.amazon.com/gp/product/B07F1NZ6GR/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 I’m trying to control it with an STM32L411 Discovery board by sending […]

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## MOSFET not switching solenoid lock

I’m trying to actuate a solenoid lock with the following specifications from the vendor’s page: Working voltage: 12 Vdc Starting current: 0.9 A Steady current: 0.12 A For this application, I’m using a circuit based on the answer to the question in this link: MOSFET to run 12 V, 0.5 A door lock My circuit […]

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## When can I neglect the voltage drop of diodes in a circuit? [closed]

Let’s suppose a Rectifier with Vd,on=0.7 V is connected to a sin-voltage source with Vamp=10 V. When in this case of forward bias can I ignore the voltage drop of the diode? Or is it only possible if the input voltage has a very high amplitude? I’ve heard that you can do in for example […]

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## MOSFET not switching solenoid lock

I’m trying to actuate a solenoid lock with the following specifications from the vendor’s page: Working voltage: 12 Vdc Starting current: 0.9 A Steady current: 0.12 A For this application, I’m using a circuit based on the answer to the question in this link: MOSFET to run 12 V, 0.5 A door lock My circuit […]