No credit will be given for answers without appropriate supporting work. Minimum

Question

No credit will be given for answers without appropriate supporting work. Minimum good presentation requires the following: (1) Symbolic expression for any formula, (2) Manipulation of symbolic expressions, not numeric expressions, (3) Substitution of numbers with units, (4) Reporting final answers with correct units and vector expressions, (5) Enough English description to allow the reader to have some idea what you are doing without looking at the math.

Open-Response Homework Problem 9.2 Consider the circuit below. All batteries have potential difference ?Vbatt. Use R1, R2, etc. for the resistances. Use the current directions drawn.

(a)List any series or parallel combinations of resistors. State whether the combinations you list are series or parallel combinations.

(b)Write a loop equation for loop 1 (ABCA).

(c)Write a loop equation for loop 2 (DACD).

(d)Write a junction equation for junction A.

Explanation / Answer

1) R1 and R2 are in series
2) -V1 + I2R3 - V2 - I3R4 - V3 = 0
3) -I1R1 + V4 - V3 - I1R2 = 0
4) I3+I2+I1 = 0

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