×Wa a Int of boy and https.//sessionmasteringphysics.com/myct mastering#/assignm

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×Wa a Int of boy and https.//sessionmasteringphysics.com/myct mastering#/assignment 6154764 B htt tps://session.masteringphysics.com/myctitemViewassignmentProblemiD-92475517 Chapter 21 HW Problem 21.42 A circuit consists of a battery connected to three resistors (70 .30 , and 180 ) in parallel The total current through the resistors is 27 A Part A Find the emt of the battery Express your answer using two significant figures. 1.05 Submit X Incorrect: Try Again; 2 attempts remaining Part B Find the current through 70- resistor.

Explanation / Answer

21.42 A)

parallel combination of resistances is given as

1/Rp = 1/70 + 1/30 + 1/180

Rp = 18.8 ohm

i = total current = 2.7 A

using ohm's law

E = emf of battery = i Rp = (2.7) (18.8) = 50.8 Volts

part B)

i1= current in 70 ohm resistor = E/70 = 50.8/70 = 0.73 A

Part C)

i2 = current in 30 ohm resistor = E/30 = 50.8/30 = 1.7 A

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