Is my TMA marked correctly????

[Virtualcom13at]

I have the results of my Tutor marked assignment (TMA) back today and i had one question wrong but i dont think it is.

Q- An electric lamp has a filament resistance of 534 ohms. when connected to a 230v supply, the current flowing would be?
A-122820
B-0.4307
C-4.307
D-2.322

I achieved my answer by using ohms law. I used, I= R/V
534 / 230 = 2.321739130434783

My answer was and is D but my tutor maked it as incorrect and the correct answer being B ????????????????

 

[JUD]

You've got it the wrong way round.

I = V/R

230/534 = 0.4307

 

[telectrix]

that's because I=V/R, not R/V.

sit at the front of the class.

 

[Virtualcom13at]

:banghead: dam i feel silly lol. :banghead: someone :30: as they are obvoiusly not working correctly. Cheers

 

[telectrix]

jud's faster fingers

 

[Virtualcom13at]

so are these all correct now.

V = IR
I = V/R
R = V/I
W = VI
I = W/V
V = W/I

 

[Virtualcom13at]

sit at the front of the class.

I have only done home study at the moment and just about to book my first weeks practical.

 

[telectrix]

fine and also W=IsquaredR

 

[JUD]

fine and also W=IsquaredR

...and also

 

[DaveyD]

jud's faster fingers

and he illustrated. B-