Multiple-Choice Homework Problem 14.7 What is the difference between DC circuits

Question

Multiple-Choice Homework Problem 14.7 What is the difference between DC circuits and AC circuits? Select One of the Following: (a) DC is carried by electrons; AC by protons. (b) DC is carried by protons; AC by electrons. (c) DC is the flow of positive charge; AC the flow of negative charge. (d) DC is produced by electric fields; AC by magnetic fields. (e) DC does not change direction; AC does.

Multiple-Choice Homework Problem 14.8 Analyze the circuit to the right with ?V1 = 12V , ?V2 = 6V , R1 = R2 = R3 = 10?. Use the directions for the currents drawn on the diagram. Write the loop equation for the loop drawn on the diagram. Select One of the Following: (a) ?V1 + I3R1 ? ?V2 ? I3R2 = 0 (b) ?V1 ? I3R1 + ?V2 + I3R2 = 0 (c) ??V1 ? I3R1 ? ?V2 + I3R2 = 0 (d) ?V1 + I3R1 ? ?V2 + I3R2 = 0 (e) ??V1 + I3R1 ? ?V2 + I3R2 = 0

Explanation / Answer

14.7

Ans: (e) DC does not change direction; AC does.

Reason:Alternating current describes the flow of charge that changes direction periodically. As a result, the voltage level also reverses along with the current. AC is used to deliver power to houses, office buildings, etc.

Direct current is a bit easier to understand than alternating current. Rather than oscillating back and forth, DC provides a constant voltage or current.

14.8

Ans:

(e) V1 + I3R1 V2 + I3R2 = 0

Reason: Applying KVL to loop given we get,

V1 + I3R1 V2 + I3R2 = 0

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