Question

In a parallel circuit, the first resistor has a resistance of 4 Ω and a current of 4 A. The second resistor has a resistance of 8 Ω but the current is unknown. The third resistor has unknown resistance, but the current is 6 A. What is the resistance of the third resistor? A. 1.0 Ω B. 2.0 Ω C. 2.7 Ω D. 12.0 Ω

Answer 1

voltage across 1st resistor = I x R = 16 volts
thus voltage across 3rd resistor is also 16 volts.

resistance = V/I = 16/6 =2.7 Ω