Two resistors

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Two

4\,\Omega

resistors, labeled

R_1

and

R_2

, are connected in series to a

16\,\text{V}

ideal battery. A switch allows a third

4\,\Omega

resistor

R_3

to be connected in parallel with

R_2

when closed. What is the ratio of the power dissipated in

R_1

after the switch is closed to the power dissipated in

R_1

before the switch is closed? (a)

2.6

(b)

1.8

(c)

1.0

(d)

1.3