Author Question: A resistor of unknown resistance and a 15- resistor are connected across a 20-V emf in such a way ... (Read 243 times)

rlane42 · **on:** Jul 28, 2018

A resistor of unknown resistance and a 15- 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
b. 12
c. 7.5
d. 30
e. 5.0

Question 2

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2
b. 7.6
c. 6.9
d. 8.0
e. 2.8