A model for cireuits Part I: Currest and resistance HW-101 4 Consider the five n

Question

A model for cireuits Part I: Currest and resistance HW-101 4 Consider the five networks shown at right. a Rank the networks according to their equivalent resistance. (Hint: Imagine placing each network in series with an indicator bulb and a battery.) b.) 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? c. d. The networks A-E above are connected, in turn, to identical batteries as shown. developed to: Use the model we have * rank the circuits according to equivalent resistance. Explain A. vi. Paralle!) ..Tren the adada tion se om Lell about the 2.T 21 saries 21 rank the circuits according to the current through the battery. Explain. 2.2

Explanation / Answer

here,

b)

when a bulb is added in series ,

as the series equivalnet is given as

Req= R1 + R2 + R2

the reistance will be added to the circuit

and the equivalent resistance will increase

c)

for a bulb added in parallel ,

1/Rp = 1/R1 + 1/R2 + 1/R3 + ..

the equivalent resistance will decrease if the bulb is added in parallel

(d)

A = r ohm

B = 2r ohm

C = r/2 ohm

and,

(1) R = r ohm

(2) R = 2r ohm

(3) R = infinite

as E is open circuited, then no current passes through (3)

(4) R = r ohm

(5) R = r ohm

(6) R = r + r/2

R = 1.5 r ohm

rank of circuit according to their equivalent resistance is , ((1) = (4) = (5)) < (6) < (2) < (3)

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