Question

Voltage across / resistor = 1 R = 0.58 A × 7 = 4.06 V

Answer 1

Voltage across $7\ \Omega$ register:

For the given circuit

The resultant resistance is

$R_{eq}=7+5||10\\R_{eq}=7+\dfrac{10\times5}{10+5}\\R_{eq}=\dfrac{155}{15}=10.33\ \Omega$

Total Current is

$I=\dfrac{V}{R_{eq}}\\I=\dfrac{6}{10.33}=0.58\ A$

So, Voltage across $7\ \Omega$ register is

$V_7=IR_7=0.58\times 7=4.06\ V$

Hence, Voltage across $7\ \Omega$ register is 4.06 V