Hot answers tagged

3 votes
Accepted

What are the potentials at front and back of inductor when primary DC supply is disconnected in LR circuit?

So my question is which of these two scenarios is correct? Neither. At the instant that S3 shorts, there is still 1 amp flowing through L1, R1 and R2. Given that R1 (2.5 Ω) is grounded to 0 volts ...
Andy aka's user avatar
  • 451k
2 votes

What are the potentials at front and back of inductor when primary DC supply is disconnected in LR circuit?

Neither case is correct. Your inductor sits between two 2.5ohm resistors with respect to ground. At steady-state current flow, your only impedance is 5 ohms (2 x 2.5ohms) which amounts to 1A in the ...
MOSFET's user avatar
  • 1,952
2 votes

What are the potentials at front and back of inductor when primary DC supply is disconnected in LR circuit?

It depends on what the zero voltage reference is. If ground is the reference, then the voltage to the left of the inductor is -2.5 V set by the current through R1 just after S3 closed. The voltage on ...
RussellH's user avatar
  • 14.5k
2 votes

Shutdown circuit of an EV gokart

When opening a contact, it will arc. AC current goes to zero twice per period, which extinguishes the arc quickly. DC current does not go to zero, so the arc will continue to burn and destroy the ...
bobflux's user avatar
  • 74.6k
2 votes

Shutdown circuit of an EV gokart

No, breaking DC current is a different matter. It may work with the AC rated one you list, but you can't count on it unless explicitly stated in the datasheet or if you have done the qualifications ...
winny's user avatar
  • 14.4k
2 votes
Accepted

Transient analysis in presence of faults

Time and currents are in log scale ... Here are the results of the simulation with microcap v12. V2 and V3 are "commands" for switching ON/OFF S1 and S2. V3 short S2, than V2 opens S1 (when ...
Antonio51's user avatar
  • 12.7k
2 votes

12V in DC fuse box even after fuse pulled

Let's be clear about how to measure those voltages: simulate this circuit – Schematic created using CircuitLab Ignore R3 for the moment. What you read on your voltmeter will depend entirely on ...
Simon Fitch's user avatar
  • 32.4k
1 vote

How to read ripple and noise on a linear power supply using RIGOL DS1202Z-e?

Technically, the connections are wired correctly, but the arrangement is poor. So like what you did, by connecting probe ground clip and scope tip to power supply ground and supply pins are correct. ...
Justme's user avatar
  • 143k
1 vote

12V in DC fuse box even after fuse pulled

If the fuse panel has LEDs to indicate blown fuses, the current through those LEDs will probably cause a meter to indicate a voltage on the output side of the fuse if no other load is connected to the ...
Peter Bennett's user avatar
1 vote
Accepted

Unstable to do resistance measurements due to electric fans

Using shielded cables fixed the problem, I will include an image of the results when I collect enough data
Tino D's user avatar
  • 141
1 vote

Capacitor "blocking DC" in a low pass filter

You seem to understand that AC currents flow through a capacitor. And current is moving charges. Any time there is a current through a capacitor, the current either charges the capacitor by adding ...
Justme's user avatar
  • 143k
1 vote

Transient analysis in presence of faults

Transient analysis. I looked at the various situations.
Franc's user avatar
  • 816
1 vote

Sharing 115 VAC ground and 28 volt DC ground

Basically the neutral line is tied to the DC Power negative line as well. NO! Do not connect the neutral of your AC mains to ground, except at the breaker box. To do so is a safety hazard, and is ...
Math Keeps Me Busy's user avatar
1 vote

How can I measure the internal resistance of a thermoelectric generator?

I connected a resistor to the thermoelectric generator and then measure the current through it, after that I used the formular R= U/I to calculated the internal resistor and found r= 517.8 ohm. ...
Transistor's user avatar
  • 175k

Only top scored, non community-wiki answers of a minimum length are eligible