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

enter image source here

1 Answer
Jan 4, 2017

Answer:

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#