In the Circuit Shown in the Figure $R _ { 1 } = 10 \Omega , R _ { 2 } = 12 \Omega , R _ { 3 } = 20 \Omega , V _ { 1 } = 1.0 \mathrm {~V} , V _ { 2 } = 7.0 \mathrm {~V}$

Multiple Choice

In the circuit shown in the figure, $R _ { 1 } = 10 \Omega , R _ { 2 } = 12 \Omega , R _ { 3 } = 20 \Omega , V _ { 1 } = 1.0 \mathrm {~V} , V _ { 2 } = 7.0 \mathrm {~V}$ , and the batteries are both ideal. What is the current through $R _ { 1 }$ ?

A) $0.80 \mathrm {~A}$
B) $0.13 \mathrm {~A}$
C) $0.18 \mathrm {~A}$
D) $0.60 \mathrm {~A}$