The circuit diagram shown in Fig includes a 6 V battery, an ammeter A, a fixed resistor `R_I` of 2` Omega ` and a resistance wire `R_2` connected between the terminals A and B. The resistance of the battery and ammeter may be neglected. Calculate the ammeter readings when the wire `R_2` is of
0.20 m length and of resistance 4`Omega `.

Explanation

Given : resistance `R_2 = 4 Omega`
Total resistance of the circuit
` R_s = R_1 +R_2 =2 +4 = 6 Omega `
By Ohm.s law,
Current `I= (V)/(R_s) = 6/6 = 1A `