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Author Question: A series circuit consists of a 100 V DC power source, a 100 resistor, and a variable resistor of ... (Read 40 times)

tfester

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Question 1

A resistor of unknown resistance and a 15-Ω 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?

75 Ω

12 Ω

7.5 Ω

30 Ω

5.0 Ω


Question 2

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



directly proportional to R.

inversely proportional to R.

directly proportional to (100 Ω + R).

inversely proportional to (100 Ω + R).

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


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Marked as best answer by tfester on Aug 6, 2020

missalyssa26

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tfester

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Reply 2 on: Aug 6, 2020
Excellent


chjcharjto14

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

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