A resistor of unknown resistance and a 15- $\Omega$ resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf.What is the value of the unknown resistance?
A)75 $\Omega$
B)12 $\Omega$
C)7.5 $\Omega$
D)30 $\Omega$
E)5.0 $\Omega$

Question

A resistor of unknown resistance and a 15- $\Omega$ resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf.What is the value of the unknown resistance?
A)75 $\Omega$ 
B)12  $\Omega$ 
C)7.5  $\Omega$ 
D)30  $\Omega$ 
E)5.0  $\Omega$

Quizplus · Accepted Answer

The Answer of A resistor of unknown resistance and a 15- $\Omega$ resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf.What is the value of the unknown resistance?
A)75 $\Omega$ 
B)12  $\Omega$ 
C)7.5  $\Omega$ 
D)30  $\Omega$ 
E)5.0  $\Omega$

A Resistor of Unknown Resistance and a 15- Ω\OmegaΩ Resistor Are Connected Across a 20-V Emf in Such a Are

A Resistor of Unknown Resistance and a 15- $\Omega$ Resistor Are Connected Across a 20-V Emf in Such a Are