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Q&A

Posts tagged current

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42%
+1 −2
Q&A Find Q point in common base BJT configuration

Suppose we have this graph: How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC) to the horizontal axis a...

1 answer  ·  posted 6mo ago by MissMulan‭  ·  last activity 5mo ago by Circuit fantasist‭

33%
+0 −2
Q&A Re model of transistor is the same in 2 different configuration

I was studying the Re model of a transistor: But the Re model for 2 different configurations (common emitter and common base )turns out to be the same! I don't know why I am really confused.How...

2 answers  ·  posted 6mo ago by MissMulan‭  ·  last activity 6mo ago by LvW‭

57%
+2 −1
Q&A Choosing Y value in photoresistor graph

I have designed a graph of the current in a photoresistor related to the brightness of light which hits the photoresistor. Our professor told us that it is more correct to draw the Current/Brigh...

1 answer  ·  posted 10mo ago by MissMulan‭  ·  last activity 10mo ago by Olin Lathrop‭

50%
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Q&A What is minimum resolution here?

In this datasheet it says that the minimum resolution is 0.1uA for the 10mA range.What is this minimum resolution?Is it the sensitivity of the multimeter for the 10mA range?

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by dsr‭

60%
+1 −0
Q&A Resistance of digital ampmeter

Can we find the internal resistance of a multimeter ,when we use the multimeter like a ampmeter, from its datasheet? I am trying to find the internal resistance of IDM 505 and I went to the datash...

2 answers  ·  posted 1y ago by MissMulan‭  ·  edited 1y ago by Canina‭

71%
+3 −0
Q&A PTC resettable fuse leakage current

Intro Hi everyone, I have a question about the practical use of a PTC (positive thermal coefficient) resettable fuse. I've never used one before, but I'd like to add one to a DC motor circuit to p...

1 answer  ·  posted 1y ago by cosined‭  ·  last activity 1y ago by Olin Lathrop‭

50%
+1 −1
Q&A Change of pins in monostable multivibrator

In monostable multivibrators we use a trigger signal applied to the base of the transistor which is usually off to enter the astable region Can we instead have a pin which is connected directly ...

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Circuit fantasist‭

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+1 −2
Q&A Series RLC circuit

How to find the equation of current of the RLC circuit after the switch is moved?

1 answer  ·  posted 1y ago by MissMulan‭  ·  edited 1y ago by MissMulan‭

50%
+1 −1
Q&A Coupling of inductors

Which will be the total series inductance?

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Andy aka‭

28%
+0 −3
Q&A Current and voltage of inductor

How do I find the current through the inductor and the voltage of the inductor after the switch is closed?

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by MissMulan‭

60%
+1 −0
Q&A Voltage and Current of capacitor

How do I find the voltage of the capacitor and the current through the capacitor after the switch is closed?

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by MissMulan‭

66%
+2 −0
Q&A Select resistor for a diode

Suppose we have this circuit How do I pick a appropriate value for the resistor R1?

3 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Olin Lathrop‭

50%
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Q&A Tunnel current equation

The current through the tunnel diode is: where $I_{f}$ is the current from the Shockley diode equation and $I_{tunnel}$ is the tunnel current. Is there an expression for the tunnel current or i...

0 answers  ·  posted 1y ago by MissMulan‭

Question diode tunnel current
25%
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Q&A Electric circuit with antenna

Moderator's note: This is getting ridiculous. You keep posting these drawings that are barely legible. The scribbling is bad enough, but the uncropped images are unacceptable. The image you ori...

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Olin Lathrop‭

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Q&A JFET equation of current

Is this equation valid only when a JFET in saturation mode , correct? because in the ohmic region the JFET acts like a voltage controlled resistor and increase in VDS increases the resistance of th...

0 answers  ·  posted 1y ago by MissMulan‭

Question voltage current jfet
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Q&A Critically damped oscillation issue

I have a question about this circuit:(critically damped oscillation) For a critically damped oscillation for a series RLC circuit the equation of current has this form I(t)=D1te^(-at)+D2e^(-at) ...

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by a concerned citizen‭

60%
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Q&A Unexpected phase shift in results

I find the current flowing through the capacitor $$\begin{align} I_{C_1}(t)&amp;=\dfrac{\mathrm{d}}{\mathrm{d}t}\left[V_1(t)-I_{C_1}(t)R_1\right] \\ {}&amp;= \dfrac{\mathrm{d}}{\mathrm{d}t}\left...

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by coquelicot‭

Question voltage current ac
50%
+1 −1
Q&A Current and voltage in AC circuits without impedance

How can we find the equation of current and voltage of a capacitor circuit if the input voltage is AC without using the impedance formula Xc = -jωC?. We have for homework to find the equation of...

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Olin Lathrop‭

Question voltage current ac
66%
+2 −0
Q&A Name of this current limiting device

I'm trying to modify a LED torch, and there is a DC-DC booster (1.5 V to 3.3 V) and after that some SOT-23 device which (I assume) keeps constant 90 mA current through LED. I know I could remove th...

2 answers  ·  posted 2y ago by Chupacabras‭  ·  edited 2y ago by Chupacabras‭