Question

A student has two resistors- 2 Ω and 3 Ω. She has to put one of them in place of R2 as shown

in the circuit. The current that she needs in the entire circuit is exactly 9A. Show by

calculation which of the two resistors she should choose.​

Answer 1

The overall current needed = 9A. The voltage is 12V

Hence by Ohm’s Law V=IR,

The resistance for the entire circuit = 129129 = 43Ω43Ω = R

R1 and R2 are in parallel.

Hence, R=(R1R2)(R1+R2)(R1R2)(R1+R2)= 4R2(4+R2)4R2(4+R2)= 4343

R2 = 2Ω

its the answer...

Answer 2

ʏᴏᴜʀ ᴀɴsᴡᴇʀ ɪs ɪɴ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ.