Circuits I: Example Using Ideal Transformer

This video analyzes a circuit involving an ideal transformer with a sinusoidal (AC) source.
University of California, Davis
ENG17: Circuits I, Spring Quarter 2015
Instructor: Dr. Kyle Montgomery
Course Website: www.kmontgomery...

[@yishinhu2951]

When hearing "Hi, I'm Dr. Kyle Montgomery." became a weekly routine... Dr. Montgomery, I don't know if you will check the comment, but I just want to say that after the whole spring quarter, I really look up to you as a role model (with your attitude toward things, your music and of course your teaching). Wish you all the best with your new job, Dr. Montgomery!!

[@Ramix09]

Did you write mirrored in the whole video? :O

[@KushMcDee]

No, he's not writing it mirrored. You can tell that the recording is simply flipped horizontally because the text on his shirt is backwards. If this helps to picture it: before they flipped the image horizontally, everything facing us actually was backwards and he was writing it normally on his side.

[@hiphop4x4]

I've done this one multiple times and looked it over and over and over. I am not getting the same results....is the set up wrong at all?

[@kyoto2839]

v is rms

[@shiganshina1480]

HALO ANAK TE UNIMED

[@febridalimunthe6313]

Kurang kerjaan bahhh

[@andresitohang2830]

Anak unimed Lae? Wahhhh

[@jeremiamarvelpurba3270]

Anjir ada aja bah kehadiran dirimu lord

[@claraaozora5120]

@@febridalimunthe6313 Penyusupp

[@easylifehacks3184]

Halo anak Harvard

[@photon2724]

i like this setup. more educational youtube videos should use this.

[@ThePhDEngineer]

Thanks!

[@saradokaj8412]

Can ask you how to you decide the voltages v1 and v2 signs and the currents direction does it work however you choose them

[@suhailasami2844]

hi, for equation 2, isn't it supposed to be negative 4I_2 rather than positive? or no?

[@dhrupadsaha4171]

nope. current is entering at one dot terminal while leaving the other dot terminal at the other side. so the sign convention taken is ok

[@ninawilliams1845]

i tought the formula with relation to the voltage and number of turns was E1/E2 =N1/N2

[@dhrupadsaha4171]

due to subtractive polarity, the negative sign is preceded.

[@mdnia6592]

Couldn't you just use Z on the primary side = (Z on the secondary side/n^2) Where n is N1/N2?

[@Shaxzara]

thank you very much Sir.

[@ThePhDEngineer]

You're welcome!

[@chrollolucilfer5297]

Isnt V1 / V2 supposed to be equal to I2/ I1

[@saleemullah7118]

you are really great , Thank you Sir.

[@ThePhDEngineer]

You are most welcome

[@JoseRoberto-0908]

Thank you!

[@ThePhDEngineer]

You're welcome!

[@gusrindal1774]

what a fucking baller... this dude is writing all this stuff backwards from his perspective :0

[@Furyistic]

video is reversed

[@Fatpapi314]

i thought the dot is where the positive terminal of the inductor in the second loop

[@altuber99_athlete]

About the dots: The dots are used to take into account the spatial orientation of a winding with respect to the other winding. If we didn't use the dots, we'd have to draw how each winding is wound around the core; this would be tedious, so instead we use the dot convention. About the positive voltage: When you draw the "+" and "-" polarities of a voltage, it means that a positive voltage (v > 0) would mean the "+" node has a higher potential with respect to the "-" node; a negative voltage for the same polarity (v < 0) would mean the "+" node has a lower potential with respect to the "-" node. Remember that when you're going to solve a circuit, you first must _assume_ a direction for the currents and a polarity for the voltages; this is where the terms _reference direction of current_ and _reference polarity of voltage_ become useful. After you solve the circuit, you can determine the actual polarity of voltages and direction of current. A voltage value on its own (for example "8 V") has no physical meaning unless you say which two nodes you're comparing their potentials; this is because voltage is a potential _difference,_ and a difference requires to compare two values (for example, when you say the height of a mountain is X meters, it actually means the diestance above the sea level to the top of the mountain; when you talk about temperature or pressure you're also comparing.)

[@luisperezalbero2174]

Hi, greetings from Spain. You have just save my life. I fall in love with you.

[@ThePhDEngineer]

Love you too!

[@Nandotsboy]

UPM?

[@jovelynguilas5467]

equation 2 should be i2=4i1