Need help with electric math problem's

Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 12:29 pm

Hello Everyone, I need some help with some electric math problem's, anyone out their that is willing to help me i will send you the question's to look over and correct the one's i have already done. Some of them i cannot fiqure out on my own and need some help with. I need to get through this corse so i can find a job! Thank You for reading this and if you can help me out please let me know
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: Yanche On: Sun May 10, 2009 4:02 pm

Post the problem in this thread so all can also learn. I will help you.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Need help with electric math problem's

PostBy: AA130FIREMAN On: Sun May 10, 2009 8:35 pm

Watts is equal to Amps x Volts. If you know 2 you can figure out the 3rd. I am not an electrician but this much I know. :idea:
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube


Re: Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 8:50 pm

Hello Yanche, Thank You for offering the help, I need it!! I really dont know how to post the question's onto this thread, i scanned them and put them into my adoble file were i can e-mail them to someone, how can i post them on here? Their are about 15 question's plus multiple choice answer's, i dont know if it would be a good idea to post them on here, you would know more about it than i do. I really dont know much about how to use the computer. Please let me know what you think about this. Really appricate the offer of your help!
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: 009to090 On: Sun May 10, 2009 8:53 pm

theo wrote:Hello Yanche, Thank You for offering the help, I need it!! I really dont know how to post the question's onto this thread, i scanned them and put them into my adoble file were i can e-mail them to someone, how can i post them on here? Their are about 15 question's plus multiple choice answer's, i dont know if it would be a good idea to post them on here, you would know more about it than i do. I really dont know much about how to use the computer. Please let me know what you think about this. Really appricate the offer of your help!

Theo, scan them in and save as a .JPG file. then you can add it to a post as an attachment. You might be able to do this with a .PDF file as well, but I am not sure.....
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice

Re: Need help with electric math problem's

PostBy: 009to090 On: Sun May 10, 2009 8:54 pm

Theo, is this thread a continuation of your other thread?
Need some help with math problem's
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice

Re: Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 9:30 pm

I am going to try to post these question's, let's see what happen's!! My son showed me this real quick, if only i can remeber this for next time!!
Attachments
IMG_0002.pdf
(537.72 KiB) Downloaded 51 times
Select:BBcode: [nepafile=12789]IMG_0002.pdf[/nepafile]
IMG_0001.pdf
(456.96 KiB) Downloaded 20 times
Select:BBcode: [nepafile=12790]IMG_0001.pdf[/nepafile]
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: 009to090 On: Sun May 10, 2009 10:04 pm

Theo, it worked, I can read both.
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice

Re: Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 10:11 pm

Alright!!,,,, now if only i can get some of these problem's solved!!
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: Yanche On: Sun May 10, 2009 10:15 pm

theo, which problems do you need help with? Refer to them by the problem number. What textbook or reference material are you studying?
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 10:36 pm

I need help with 16, 17, 7, 11, and 13. Also would like to go over the one's (circled answer) i already have done to see if they are correct
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: theo On: Sun May 10, 2009 10:39 pm

Sorry, i forgot to mention that these are on resonant circuits.
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2

Re: Need help with electric math problem's

PostBy: Yanche On: Mon May 11, 2009 12:30 am

Ok. Let's start with Question #7

"7. As far as the generator is concerned, in a series-resonant LC circuit( with no resistor) L, and C can be replaced by:

A. a single resistor with a value equal to L x C.
B. the value of C.
C. the value of L.
D. a straight piece of wire."

Take a look at this link on series resonant circuits. http://www.allaboutcircuits.com/vol_2/chpt_6/3.html

Now ask yourself what is the value of the circuit impedance, i.e. the resistance at resonance? Which of the answers best represents that value of resistance?


Question #11

"11. When a capacitance is given as 6.3 x 10 E-6 farads, it can be written as:

A. 6.3 millifarads
B. 6.3 microfarads
C. 6.3 nanofarads
D. 6.3 picofarads

Take a look at the link: http://en.wikipedia.org/wiki/Engineering_notation

It's a special case of scientific notation which expresses large or small numbers as powers of ten multipliers. For example one thousand would be 10 E+3, read as 10 to the plus 3. 10 times, times 10, times 10 = 1000. Similarly one thousand of an inch (one divide by one thousand) would be 10 E-3, read as 10 to the minus 3. What's special in engineering notation vs. scientific notation is the 1000 multiplier or divisor

Note in the wikipedia table the prefixes milli, micro, nano and pico. These prefixes are very common in electronics. Memorize them. Now what is the correct answer?
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Need help with electric math problem's

PostBy: Yanche On: Mon May 11, 2009 12:58 am

A good link for studying series and parallel LC circuits is http://www.allaboutcircuits.com/worksheets/ac_s_p.html

It has many examples, with answers.

The discussion about circuit Q and bandwidth is here:
http://www.allaboutcircuits.com/vol_2/chpt_6/6.html

This should help answer #13. Remember at resonance a parallel circuit of R and L is at a maximum. But the question is to compare a circuit with a shunted 10 ohm or 10 megohm resistor. Which would have the most adverse effect on the overall circuit impedance? Hint one would shunt more current around the C and L.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Need help with electric math problem's

PostBy: theo On: Tue May 12, 2009 3:32 pm

Hello Yanche, i want to say that for question 7 it would be answer d- straight piece of wire, and for question 11 it would be 6.3 microfarads
theo
 
Stove/Furnace Make: LL
Stove/Furnace Model: Hyfire 2