Question

please answer please ​

Answer 1

Answer:

60 Ω

Explanation:

We know that, in a parallel circuit, the voltage across each resistor is the same.

Voltage across 20Ω, V=I2×R2

                                  =20×0.3

                                  =6 V

Current across 15Ω, I2=V/R2

                                 =6/15

                                 =0.4 A

Applying Kirchhoff's junction rule,

                     I1+I2+I3=IA

                     I1+0.3+0.4=0.8

                  ∴I1=0.1 A

∴Resistance R1=V/I1

                        =6/0.1

                        =60 Ω