Question

Refer to the image below and also give explanation for your answer...?

Answer 1

Option A

Explanation:

In diagram 1.

Given `V=3.0V`, and `I=0.5A`,
Using Ohm's Law we get the resistance `R` as

`R=V/I`
`=>R=3.0/0.5=6Omega`

In diagram 2.

The voltage remains same and there is no change in the position of voltmeter. As such `V=3.0V`

An identical resistor is added in parallel with the first resistor. The combined resistance `R_c` can be found from the resistances in parallel equation

`1/R_"total"=1/R_1+1/R_2`
`=>1/R_c=1/6+1/6`
`=>1/R_c=1/3`
`=>R_c=3Omega`

New current is found using Ohm's Law

`I=V/R`
`=>I=3.0/3`
`=>I=1A`