PHY: A model for circuits Part 1, Current and resistanceA model for circuits Con

Question

PHY: A model for circuits Part 1, Current and resistanceA model for circuits

Consider the five networks shown at right. Rank the networks according to their equivalent resistance. (Hint: Imagine placing each network in series with an indicator bulb and a battery.) How does adding a single bulb to a circuit in series with another bulb or network affect the resistance of the circuit? How does adding a single bulb to a circuit in parallel with another bulb or network affect the resistance of the circuit? The networks A-E above are connected, in turn, to identical batteries as shown. Use the model we have developed to: rank the circuits according to equivalent resistance. Explain. rank the circuits according to the current through the battery. Explain.

Explanation / Answer

a)A : R

B : 2R(two resistors in series)

C : R/2 (parallel)

D: zero

E: infinty

so E>B>A>C>D

b)resistance will increase

c)decreases

d)i) Req = R

2)Req = 2R

3)Req = infinity

4)Req = R

5)Req = R

6)Req = 3R/2

3>2>6>1=4=5

current will be reverse => 5=4=1>6>2>3

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