An ideal battery is connected in series with a fixed resistor and a variable resistor…

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

Problem

An ideal

12\,\text{V}

battery is connected in series with a

10\,\Omega

fixed resistor and a variable resistor initially set to

10\,\Omega

. 1. Calculate the current when the variable resistor is

10\,\Omega

. 2. The variable resistor is then increased to

30\,\Omega

. Calculate the new current. Which of the following pairs correctly lists the current before and after the adjustment? (a)

0.60\,\text{A};\;0.24\,\text{A}

(b)

1.20\,\text{A};\;0.40\,\text{A}

(c)

0.60\,\text{A};\;0.30\,\text{A}

(d)

0.60\,\text{A};\;0.40\,\text{A}