current flowing through resistance

I am having trouble, can I please get some assistance with these questions! Four resistors with resistance, R1= 6ohms, R2= 4ohms, R3= 5ohms, and R4= 3ohms are arranged in the circuit to the right along woth a battery with a potential difference of 12V. A. What is the equivalent resistance of the entire circuit? B. What is the potential across and the current through resistor R1? C. What is the potential across and the current through resistor R4? D. What is the power dissipated by resistor R1?

min firinim RI R. 11. In the circuit at right, let all internal resistances be r= 2o and all other R2 resistances be R = 80 a. The battery MFs are: R3 5 = 600 v 5, = 120 v 5 = 240 v R7 R6 What is the current through resistor (R,)? (in amps) a. 3.664 b. 4.580 c. 1.832 d. 2.748 e. 1.791 tüit

DLTAILJ TRLUIOUJ ANJULIJ 03CULPHI32010 20.3.0WA.U21. Mf NOTS ASK TUUR TEACHER PRACTICE ANUTHER Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.3 um x 1.3 um in area. A measurement of the potential difference across the inner and outer surfaces of the membrane gives a reading of 92.6 mV. The resistivity of the membrane material is 1.30 x 107 2. m. (a) Determine the amount of current that flows through this portion of the membrane. A (b) By what factor does the current change if the side dimensions of the membrane portion is halved? The other values do not change.