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A series circuit consists of a 100 V DC power source, a 100 ? resistor, and a va

ID: 1423487 • Letter: A

Question

A series circuit consists of a 100 V DC power source, a 100 ? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ? (see Presentation3.pdf). The current in the circuit is

Presentation3.pdf

directly proportional to R

inversely proportional to R

directly proportional to (100 ? + R)

inversely proportional to (100 ? + R)

a.

directly proportional to R

b.

inversely proportional to R

c.

directly proportional to (100 ? + R)

d.

inversely proportional to (100 ? + R)

e.

neither directly nor inversely proportional to R or to (100 ? + R)

Explanation / Answer

currrent = V/ 100+ R

so

inversely proportional to (100 + R)

d.

inversely proportional to (100 + R)

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