Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
6394:
steady spd-->dist btwn dots stay de same
higher staedy spd-stays same thru out but the space By the way dots is more dan abv
acceleration-distan btwn dot in creases ....... . . . . . . . .
deceleration -. . . . . . . . . ..........
hope it hlps
:P :P
the_grim_reaper:
--- Quote from: 6394 on May 26, 2010, 11:51:16 pm ---it 2.55 hre
=P
--- End quote ---
2 am in Riyadh :D. Guys I'm gona say it again PLEASE CAN ANYONE TELL ME HOW A BRIDGE RECTIFIER WORKS!!!!!!!
Ivo:
--- Quote from: A@di on May 26, 2010, 08:19:27 pm ---10ai) Step up transformer obviously.
aii) Less current, less electrical energy lost, less heat energy given out
b) P = V*I, I = 55k/22k = 2.5
c) Rate of loss formula, P = I^2R = 2.5^2*3 = 18.75
d) The overall voltage reduced from 22K Volts due to the resistance of the wire, till it reaches the receiving end.
I know this is confusing sh*t, it had appeared in my paper! nov 09! V = 2.5*3 = 7.5
from wiki "For example, an electric space heater may very well have a resistance of ten ohms, and the wires which supply it may have a resistance of 0.2 ohms, about 2% of the total circuit resistance. This means that 2% of the supplied voltage is actually being lost by the wire itself."
e) 22000 - 7.5 -7.5 = 21985 (2 times 7.5 because there are two wires, each voltage dorp = 7.5)
--- End quote ---
This is from W09, it's a nightmare. What's voltage drop?
Ivo:
--- Quote from: deadman786 on May 26, 2010, 11:58:56 pm ---Ivo the formula I wrote oh sh*t sorry it's distance=ut+.5at^2 (a is acceleration. Sorry for using mass! VERY VERY VERY VERY SORRY!!!) U see that's why I don't like to answer questions even if I know the answers. I'm afraid I might tell something wrong and it'll screw the guy I'm trying to help :D.
Anyway, you see some hydroelectric stations have a pumped storage feature. See demand varies at different times and seasons bla bla bla. So when demand is less and u're producing more energy, you can use it to pump the water that goes out of the dam back up to a higher-level reservoir. My book claims that it's easier to do this than to reduce the output of the generator (who wants to stop running water :D)..
So at peak times, the water will flow out again from the high level reservoir and the pe it has is converted to electrical energy. You can get 3-quarters of the electrical energy that was used to pump it back up in the first place.. (this answer is correct so it can be relied upon :D)...
--- End quote ---
Thanks man, great explanation. I'll rep you!
the_grim_reaper:
--- Quote from: Ivo on May 27, 2010, 12:03:33 am ---This is from W09, it's a nightmare. What's voltage drop?
--- End quote ---
Drop in voltage :D. If power is being lost than it's bound to have an effect!!!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version