a) Using Kirchhoff's rules, calculate the current in R 1 with the directions indicated in the figure below. Assume that R 1 = 3.00 k, R 2 = 4.00 k, R...

a) Using Kirchhoff's rules, calculate the current in R1 with the directions indicated in the figure below.

Assume that R1 = 3.00 kΩ, R2 = 4.00 kΩ, R3 = 5.00 kΩ, E1 = 65.0 V, E2 = 60.0 V and E3 = 80.0 V. NOTE : If the current points in the opposite direction indicated, please use a negative sign.

b) Calculate the current in R2. 

c) Calculate the current in R3.

d) Calculate the magnitude of the potential difference between points c and f.