I'm rewatching the series to reinforce the information. And chuckled at the talk about capacitors exploding lol... when you said "it let's the smoke out." That reminded me of something one of my radio repair instructors in the army said... "Electronics run on smoke. When the smoke comes out, they stop running."
You only need any two of the numbers... E, I, R, and P. If you remember "E over IR" and "P over IE". You can calculate any of the other numbers with simple math, and the last formula. That's the only formula you need to memorize. The one for volts (E) if you have P and R, but don't know I. Everything else you can use the two circles.
At 55:00 you are working on question G5B12 from the pool. I can calculate the voltage that you got, but I don’t understand why you do not convert it to the RMS value. How do we know that this voltage is already RMS?
@@W4EEY thanks so much, I really thought I had that down the first time watching with you, but kept messing up the answer on the practice exam. I’ll have to review that concept again to get it straight.
There is Ohms law that shows the relationship between Voltage, Current and Resistance. And there is Watt's Law that shows the relationship between Power, Voltage and Current. When you combine the two you get the derived formulas of: P = I(squared) R and P = E (squared) divided by R. Here's a link with more: byjus.com/physics/electric-power/ 73 de W4EEY
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Thank you for making these videos available!!! I feel like I’m part of the class, even thought I’m watching it 10 months later!!!
You're so welcome! Good luck with your studies. You can do it! 73 de W4EEY
I'm rewatching the series to reinforce the information. And chuckled at the talk about capacitors exploding lol... when you said "it let's the smoke out." That reminded me of something one of my radio repair instructors in the army said... "Electronics run on smoke. When the smoke comes out, they stop running."
Yup. We say the same thing. But don't tell anyone - its a secret! 73 de W4EEY
You only need any two of the numbers... E, I, R, and P. If you remember "E over IR" and "P over IE". You can calculate any of the other numbers with simple math, and the last formula. That's the only formula you need to memorize. The one for volts (E) if you have P and R, but don't know I. Everything else you can use the two circles.
Yup! A Gold Star for you! 73 de W4EEY
At 55:00 you are working on question G5B12 from the pool. I can calculate the voltage that you got, but I don’t understand why you do not convert it to the RMS value. How do we know that this voltage is already RMS?
Power is expressed as RMS by convention. So no conversion is necessary. 73 de W4EEY
@@W4EEY thanks so much, I really thought I had that down the first time watching with you, but kept messing up the answer on the practice exam. I’ll have to review that concept again to get it straight.
Since RMS voltage is what is being solved at 56:09, shouldn't that 245v value have been multiplied by 0.707 to get 173v?
Power = Vrms x I. So the voltage we are solving for is already RMS. 245V in this case is RMS voltage. 73 de W4EEY
Anyone else immediately go and look up capacitors exploding to see how big of an explosion they cause?
Why are we squaring Ohm’s law values? I haven’t seen that before. Example: E=I/R has always been what I’ve seen. Now it’s E=I(2)/R? I’m not following.
There is Ohms law that shows the relationship between Voltage, Current and Resistance. And there is Watt's Law that shows the relationship between Power, Voltage and Current. When you combine the two you get the derived formulas of: P = I(squared) R and P = E (squared) divided by R.
Here's a link with more: byjus.com/physics/electric-power/
73 de W4EEY
My trick for remember is PIE like a 🥧 then for RIE i think of the R as Reverse for reverse the letters in the PIE chart.
Cool! Thanks for sharing. 73 de W4EEY