physics question

• kct360

  13 Jun 07, 18:19

  when resistance increase, the voltage increase or current decrease?
• omgukilledkenny

  13 Jun 07, 18:26

  voltage = current X resistance
  
  V = I*R
  
  when resistance increases, Voltage Increases
  
  I = V/R
  
  when resistance increases, Current Decreases.
• I_love_my_toilet

  13 Jun 07, 18:28

  if i dun rem wrongly
  
  voltage, V = Current, I X Resistance, R
  
  V= IR
  
  try working out
• Darkness_hacker99

  13 Jun 07, 18:28

  -__-" you typed wrong question just now.
• I_love_my_toilet

  13 Jun 07, 18:29

  Originally posted by omgukilledkenny:

  voltage = current X resistance
  
  V = I*R
  
  when resistance increases, Voltage Increases
  
  I = V/R
  
  when resistance increases, Current Decreases.

  100% !!!!!!!!!!!!!
• omgukilledkenny

  13 Jun 07, 18:29

  
• popikachu

  13 Jun 07, 19:13

  physic is making me mad... haiz...
  
  now learning e=ivt
  
  sainz...
  
  so many formula to remember de... >.<
• jay_rocks

  13 Jun 07, 19:18

  voltage!
• darkhour

  13 Jun 07, 19:18

  basically for now u see by formula as stated by all above loh...but if u want to knw why isit like that u muz see the definition of the terms...physics is all abt picturing what is going on...
• kct360

  14 Jun 07, 13:08

  so if there is a case where resistance is 5omhs, 10v, 2A. then when resistance doubled, would it become
  a) 20v , 2A or
  b) 10v , 1A ?
  
• TrixCereals

  14 Jun 07, 13:11

  Originally posted by popikachu:

  physic is making me mad... haiz...
  
  now learning e=ivt
  
  sainz...
  
  so many formula to remember de... >.<

  Pika, rmb as vit=e (vitamin e)
  
  Where,
  
  V = Voltage
  I= Current
  Q=IT=Charge (Rmb as kill it)
  T= Time
  
  
• TrixCereals

  14 Jun 07, 13:13

  Originally posted by kct360:

  so if there is a case where resistance is 5omhs, 10v, 2A. then when resistance doubled, would it become
  a) 20v , 2A or
  b) 10v , 1A ?
  

  a) i think.
  
  Cos to get 10ohm = 20v/2a
  
  And 10v/1a =/= 10ohm.
• tut4nkh4m3n

  14 Jun 07, 13:15

  Originally posted by omgukilledkenny:

  voltage = current X resistance
  
  V = I*R
  
  when resistance increases, Voltage Increases
  
  I = V/R
  
  when resistance increases, Current Decreases.

  just sub it into this you'll get it
• kct360

  14 Jun 07, 13:40

  Originally posted by tut4nkh4m3n:

  just sub it into this you'll get it

  what im meaning that in that case, there should be 2 answers? cos when done both ways, the resultant resistance is still the same.
• AndrewPKYap

  14 Jun 07, 13:42

  Originally posted by omgukilledkenny:

  voltage = current X resistance
  
  V = I*R
  
  when resistance increases, Voltage Increases
  
  I = V/R
  
  when resistance increases, Current Decreases.

  ahhh... smart... but do you know "Why"?
• airgrinder

  14 Jun 07, 13:47

  hey.
  
  you'll have to learn with understanding, and not just applying the formular.
  
  V=IR
  
  So for anything that has a higher resistance, in order to conduct current, the voltage difference had to increase.
  
  Current is dangerous and inefficient, as current can easily kill people, and when you're "transmitting" huge amount of current, there's always the problem of heat loss, which is equalivant to power loss, hence inefficient.
  
  So pratical sense, current is usually the constant.
  
  Applying to everyday life, you see those power stations, etc, they always have "HIGH VOLTAGE" sign.
  
  If the voltage difference is high enough, current can even be transmitted through air.
  
  
• I_love_my_toilet

  14 Jun 07, 13:51

  Originally posted by airgrinder:

  hey.
  
  you'll have to learn with understanding, and not just applying the formular.
  
  V=IR
  
  So for anything that has a higher resistance, in order to conduct current, the voltage difference had to increase.
  
  Current is dangerous and inefficient, as current can easily kill people, and when you're "transmitting" huge amount of current, there's always the problem of heat loss, which is equalivant to power loss, hence inefficient.
  
  So pratical sense, current is usually the constant.
  
  Applying to everyday life, you see those power stations, etc, they always have "HIGH VOLTAGE" sign.
  
  If the voltage difference is high enough, current can even be transmitted through air.
  
  

  how high is high ?
  
  can transmission of current thru air occur naturally in reality ?
• unclebutcher

  16 Jun 07, 13:46

  V=IR.
  usually voltage is constant(in household sense) so current decreases if resistance increases.
  
  
• Herzog_Zwei

  16 Jun 07, 13:54

  Originally posted by I_love_my_toilet:

  how high is high ?
  
  can transmission of current thru air occur naturally in reality ?

  Ever seen lightning? That is one version.