Why are household electrical outlets wired in parallel rather than in series?
AParallel uses less wire
BParallel ensures each outlet gets full voltage and operates independently
CSeries would be too dangerous
DThere is no particular reason
Parallel wiring gives each outlet the full supply voltage (120V or 240V) and lets each device operate independently. If outlets were in series, unplugging one device would break the circuit for all devices, and the voltage would divide unpredictably among them.
Question 2 True / False
Three 1.5 V batteries in series produce 4.5 V. Three 1.5 V batteries in parallel also produce 4.5 V.
TTrue
FFalse
Answer: False
Three 1.5 V batteries in series produce 1.5 + 1.5 + 1.5 = 4.5 V (voltages add). Three in parallel produce only 1.5 V (same voltage, but the batteries share the current load and last longer). Series adds voltage; parallel adds current capacity.
Question 3 Short Answer
A string of decorative lights has 50 bulbs in series. If one bulb burns out, all 50 go dark. How would you redesign this for better reliability?
Think about your answer, then reveal below.
Model answer: Wire the bulbs in parallel, or use a hybrid approach: wire groups of 5-10 bulbs in series (to share voltage and reduce wiring), then wire those groups in parallel (so one group's failure does not affect the others). Modern Christmas lights use shunt resistors that bypass a failed bulb to keep the rest of the series string lit.
Pure parallel would require each bulb to handle the full supply voltage, which may not be practical for small bulbs. The series-parallel hybrid gives the best of both worlds: series within groups keeps the voltage per bulb low, while parallel between groups provides redundancy.