An electrical circuit consists of a voltage source having an electromagnetic force E and an internal resistance r, resistors (R), circuit breakers (S), and ideal voltmeters (V).
Given that R2 = 2 omega.
In the state where both switches are open, the voltage meters (voltmeters) show V2 = 10V, V1 = 25V.

A.  Calculate the resistance R1.
B. On which resistor does greater power develop? Necrosis.
C. Close switch S2. Will V1 voltage increase, decrease, or not change? Necrosis.
D. Close both switches. Will V1 voltage increase, decrease, or not change? Necrosis.

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R1 R, S, E, R R1 R, S, E, R