011

┘

007 P = U x I

 

U = I x R >>> R = U / I

P = U x I

P = I x R x I   >>>   P = I² x R

P = I² x R

P=I² x R     >>>  

I²=P/R     >>>  

I² = 2 / 50 >>>  

I² = 0.04 = 40mA

I = √0.04 A = 200 mA