Calculate the Current

[skystorm]

Hi all

Can anyone remind me how to do this again ?

calculate the current taken by a 100 wat lamp having a working resistance 0f 200ohm

 

[Sidewinder]

Operating voltage is?...

 

[Theorysparky]

P = i square x r

i squared = P/r

i squared = 0.5

i = square root of 0.5

= .707 amps ?

 

[Theorysparky]

Electric power, voltage, current, and resistance - electricity calculations - electrical ohms law formula wheel power formulas - sengpielaudio

---------- Post Auto-Merged at 22:30 ---------- Previous post was made at 22:29 ----------

690volts ?

currents not volts

---------- Post Auto-Merged at 22:30 ---------- Previous post was made at 22:30 ----------

Electric power, voltage, current, and resistance - electricity calculations - electrical ohms law formula wheel power formulas - sengpielaudio---------- Post Auto-Merged at 22:30 ---------- Previous post was made at 22:29 ----------

currents not volts

141 volts

 

[Theorysparky]

missed that mate

 

[skystorm]

Thank you all i have got to old for this lol