Help !!!

[jboy1888]

Can anyone help me with this question?

"How many watts are being consumed in a circuit with 0.2 amps flowing through 100 ohms of resistance"

thats all there is to the question if there was voltage stated it would not be so hard.

Thanks

 

[scotsparky]

you have to work out the voltage using OHMs law before doing the power calc. Theres a hint and i am not doing homework.

V=IxR
P=IxV

 

[jboy1888]

thanks scotsparky ive never knew about p=IxV equation

thanks again

 

[Spudnik]

Read his post again.

 

[scotsparky]

Read his post again.

is that for me or Jboy Jas?

 

[Mac]

Can anyone help me with this question?

"How many watts are being consumed in a circuit with 0.2 amps flowing through 100 ohms of resistance"

thats all there is to the question if there was voltage stated it would not be so hard.

Thanks

P=I squaredxR=4 watts
Ohm's Law

 

[scotsparky]

Mac surly Power=IV Voltage is V=IR

or am i totall wrong?????

 

[Guest123]

Sorry Mac but that formula is wrong mate.

 

[scotsparky]

from OP
v = IxR = 0.2 X100 = 20Volts
P= IxV = 0.2 X 20 = 4 watts

 

[Mac]

from OP
v = IxR = 0.2 X100 = 20Volts
P= IxV = 0.2 X 20 = 4 watts

I would only use the iIsquared R formula when i have a power factor to devide it by.

That's what i thought.I have always used ohms law as V=IxR P=V/I I=V/R

 

[scotsparky]

well thats somebodys homework done for him NEXT!!!!!!!!!!!!!!!!!!!

 

[jboy1888]

P=I squaredxR=4 watts
Ohm's Law

or even p=EI cos

this would also give you the true power. So i guess im giving myself the answer, i couldnt see it for looking at it. Do you guys remember this or is there something you refer to for formulas. Ohms law is straight forward enough to remember its just the more complex ones im refering to.

 

[Guest123]

That's what i thought.I have always used ohms law as V=IxR P=V/I I=V/R

P=VxI.

 

[Spudnik]

is that for me or Jboy Jas?

Sorry, was for Jboy.

 

[scotsparky]

jboy this is the BASICS as you learn more you will just remember it.

 

[Mac]

P=VxI.

So it is,typing too fast

 

[Guest123]

Jboy,

I found the easiest way to remember all the variations of equations in the beginning until you're used to them was to try and asociate a name or place with each one i.e - Ivy Watts for power etc. It's whatever works for you.