Homework Help

What is the resistance of R1?

it-sall-in-the-brain's profile pic

Posted via web

dislike 0 like

What is the resistance of R1?

This image has been Flagged as inappropriate Click to unflag
Image (1 of 1)

1 Answer | Add Yours

justaguide's profile pic

Posted (Answer #1)

dislike 1 like

A potential difference of 60 V is applied across the resistor `R_1` and the two resistors in series `R_2` and `R_3` .

The current flowing through resistor `R_1` due to the voltage applied is `I_(R_1) = 60/(R_1)` . The current that flows through `R_2` and `R_3` is the same. It leads to a potential difference of 30 V across `R_2` . This gives the current `I_(R_2) = 30/(R_2)`

The total current of 2 A is the sum of `I_(R_1) = 60/(R_1)` and `I_(R_2) = 30/(R_2)` . It is not possible to solve the equation `2 = 60/(R_1) + 30/(R_2)` for a unique value of `R_1` .

The data provided is not sufficient to determine the resistance of `R_1`

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes