# 7. A circuit is comprised of a non-ideal emf device (that is, one that has an internal resistance r) andtwo resistors R, and R2.a. Draw this configuration for the case where the three resistances are configured in parallel.b. Draw an arrow representing the direction in which the current leaves the emf device.c. Find an expression for current, in terms of the emf, r, R1, and R2.

Question
1 views help_outlineImage Transcriptionclose7. A circuit is comprised of a non-ideal emf device (that is, one that has an internal resistance r) and two resistors R, and R2. a. Draw this configuration for the case where the three resistances are configured in parallel. b. Draw an arrow representing the direction in which the current leaves the emf device. c. Find an expression for current, in terms of the emf, r, R1, and R2. fullscreen
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Step 1

Given:

Two resistors = R1 and R2

Internal resistor = r

Step 2

Circuit can be drawn as:

Step 3

Expression for the curren... help_outlineImage TranscriptioncloseR,R, total external resistance, R = R + R, effective resistance,R eff R, + R, 1 R eff R,R, r(R + R, ) + R,R, R rR,R, hence current, I = R, eff r(R +R,)+ R¸R, I = ɛ rR,R, rR +rR, + R,R, I = E rR,R, fullscreen

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