Page 2 of 11

### Re: Circuit Lab B/C

Posted: September 23rd, 2018, 9:13 am
All right!

Describe the behavior of an RC circuit which is a) charging and b) discharging.
a) The voltage through the resistor starts high and decays exponentially as the capacitor becomes saturated. The charged capacitor has an extremely high voltage drop.
b) The voltage through the resistor starts high and decays exponentially as the capacitor discharges. The capacitor acts as a voltage source in the absence of other sources.

### Re: Circuit Lab B/C

Posted: September 26th, 2018, 2:53 pm
Do current and voltage sources exist in real circuits?

### Re: Circuit Lab B/C

Posted: September 26th, 2018, 3:34 pm
Do current and voltage sources exist in real circuits?
Not ideal ones but they can be approximated; however, real-life sources have a limited amount of charge (which can be measured in ampere-hours) and have internal resistance that sometimes needs to be accounted for.

### Re: Circuit Lab B/C

Posted: September 26th, 2018, 4:47 pm
Do current and voltage sources exist in real circuits?
Not ideal ones but they can be approximated; however, real-life sources have a limited amount of charge (which can be measured in ampere-hours) and have internal resistance that sometimes needs to be accounted for.

### Re: Circuit Lab B/C

Posted: September 26th, 2018, 4:55 pm
What is doping in the context of PN junctions and why is it done?

### Re: Circuit Lab B/C

Posted: September 26th, 2018, 8:13 pm
What is doping in the context of PN junctions and why is it done?

### Re: Circuit Lab B/C

Posted: September 27th, 2018, 1:19 pm
What is doping in the context of PN junctions and why is it done?

### Re: Circuit Lab B/C

Posted: September 27th, 2018, 2:13 pm
Calculate the RMS voltage of a 12V peak-to-peak sinusoidal AC signal and a 0-6V square wave with a time-on of 8ms and a period of 10 ms.

### Re: Circuit Lab B/C

Posted: September 27th, 2018, 3:31 pm
Calculate the RMS voltage of a 12V peak-to-peak sinusoidal AC signal and a 0-6V square wave with a time-on of 8ms and a period of 10 ms.
$12\ V \cdot \frac{\sqrt2}{4} = 3\sqrt2\ V$

$\sqrt{\frac{8\ ms}{10\ ms} * (6\ V)^2} = 5.367\ V$

### Re: Circuit Lab B/C

Posted: September 27th, 2018, 7:45 pm
Calculate the RMS voltage of a 12V peak-to-peak sinusoidal AC signal and a 0-6V square wave with a time-on of 8ms and a period of 10 ms.
$12\ V \cdot \frac{\sqrt2}{4} = 3\sqrt2\ V$

$\sqrt{\frac{8\ ms}{10\ ms} * (6\ V)^2} = 5.367\ V$
Looks good!

### Re: Circuit Lab B/C

Posted: September 28th, 2018, 9:00 am
All right! Derive an equation for the power given off by a resistor from Ohm's law.

### Re: Circuit Lab B/C

Posted: September 28th, 2018, 1:56 pm
All right! Derive an equation for the power given off by a resistor from Ohm's law.

### Re: Circuit Lab B/C

Posted: September 28th, 2018, 2:01 pm
All right! Derive an equation for the power given off by a resistor from Ohm's law.
Yep, your turn, although I was thinking of a derivation using
Definition
But that's a little more complicated (and equivalent).

### Re: Circuit Lab B/C

Posted: October 4th, 2018, 1:29 pm
Two resistors are combined in a circuit. First, they are combined in series. Then, they are combined in parallel. What is the equivalent single resistance of each setup?

### Re: Circuit Lab B/C

Posted: October 4th, 2018, 1:32 pm
Two resistors are combined in a circuit. First, they are combined in series. Then, they are combined in parallel. What is the equivalent single resistance of each setup?
$R_{series} = R_1 + R_2$
$R_{parallel} = \frac1{\frac1{R_1} + \frac1{R_2}}$