Find the current flowing through the resistance R 1 of the circuit shown in figure if the resistances are equal to R 1 = 10 Ω Ω , R 2 = 20 Ω Ω , and R 3 = 30 Ω Ω , and the potentials of points 1, 2 and 3 are equal to ϕ 1 = 10 V, ϕ 2 = 6 V, and ϕ 3 = 5 V.
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B
Apply KCL for circuit
current in resistance 
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