Recent content by lymos

Homework Statement A voltaic element with electromotive voltage E=1,1V and with internal resistance r=1ohm, is connected to an external resistor with the resistance R=9ohm. Determine the current I which circulates in the circuit, also the falls of voltage on the external portion of the circuit...

I think I translated it bad, 'cause I'm not English, but generally it's not added, this is the same power source, only resistors are changed, this is why we have 2 time values which are equal, but are not important, so they didn't gave us them. thanks for the idea :)

well, it looks tricky. here is a variant, which was suggested buy another guy on the internet:

Homework Statement To a source of current, one by one are added 2 resistances, first R1=1ohm, then R2=4ohm. In both cases, in the same period of time (t=t1=t2), the resistors give the same amount of heat (Q=Q1=Q2). Determine the internal resistance ("r" small r) of the electric source...