a-student-made-the-electric-circuit-shown-below-to-measure-an-unknown-resistor-r

Question

A student made the electric circuit, as shown in the figure below, to measure the value of an unknown resistor, R_a, that is using ideal batteries. The red ammeter indicates a value of 2.25 A. Find the resistance of R_a.

Circuit diagram showing an ammeter reading 2.25 A and an unknown resistor Ra.

Accepted Answer

R_a = 6.22 Ω

Answer

R_a = 1.00 Ω

Answer

R_a = 4.89 Ω

Answer

R_a = 11.1 Ω