1. The figure shows a section of a circuit. The resistances are R 1 = 2.1 ?, R 2
ID: 581325 • Letter: 1
Question
1. The figure shows a section of a circuit. The resistances are R1 = 2.1 ?, R2 = 5.0 ?, and R3 = 6.9 ?, and the indicated current is i = 6.5 A. The electric potential difference between points A and B that connect the section to the rest of the circuit is VA - VB = 79 V. (a) Is the device represented by “Box” absorbing or providing energy to the circuit, and (b) at what rate?
2.
In the figure ? = 13.3 V, R1 = 2580 ?, R2 = 2330 ?, and R3 = 4490 ?. What are the potential differences (in V) (a) VA - VB, (b) VB - VC, (c) VC - VD, and (d) VA - VC?
R2 WBox Box RgExplanation / Answer
(1) Potential difference about R3 = 6.5*6.9 = 44.85 Volt
potential drop in R1 = 79 -44.85 = 34.15 volt
Current in R1 = 34.15 / 2.1 = 16.262 A
Current in R2 = 16.262 - 6.5 = 9.76 A
potential drop in R2 = 9.76*5= 48.809 Volt
but drop should be 44.85 volt only because it is in parallel with R3
therefore box is providing energy .
the voltage provided by the box will be = 48.809 - 44.85 = 3.96 volt
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.