Question

What is the total potential difference of the battery shown below: (A) 3 V (C) -3V (B) 6V (D) -6V

Please tell the answer with explanation !!​

Answer 1

Answer:

Let resistors P, Q, and R have resistance r. The effective resistance across the source is

R

eff

=r+r∣∣r=r+

r+r

(r)(r)

=r+

2

r

=

2

3r

Current drawn from source is

I

s

2

R

eff

=12 or I

s

=

R

eff

12

=

r

8

A

Since Q and R have equal resistance r, each draws a current of I, which is given by

I=

2

1

I

s

=

r

2

A

Heat dissipation in R can now be determined and is given by

I

2

r=(

r

2

)r=2W

Explanation:

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