1. Students are experimenting with circuits in their physics class and they buildthe two working circuits pictured below. The battery in each circuit is identicaland each bulb (resistor) they add provides the same amount of resistance.Circuit ACircuit BR2R3They notice that every time they added bulb 3 (R3) to Circuit A, the brightness of allthe bulbs dimmed but when they added bulb 3 (R3), nothing changed in thebrightness of the bulb.Which explanation of this observation is most complete? OThe brightness of the bulbs is all about the total amount of voltage at eachresistor: less voltage dimmer bulbs. Circuit A is a series circuit, so the voltageof the battery is divided across all of the resistors. Circuit B is a parallel circuitso the voltage across each resistor in parallel is the same as the battery%3DThe brightness of the bulbs has to do with power which considers both thevoltage and the current: less voltage x less current = dimmer bulbs. In circuit A,the voltage is divided across the resistors and the current decreases asresistance increases. In circuit B, the voltage is the same in each parallel sectionof the circuit and the current through that section of the circuit only depends onthe resistor in that section.The brightness of the bulbs is all about the total amount of resistance in thecircuit: more resistance dimmer bulbs. Circuit A is a series circuit, so everytime you add a resistor the total resistance increases. Circuit B is a parallelcircuit, so every time you add a resistor the total resistance decreases.

The brightness of a bulb depends on the power dissipated across the bulb. In circuit A, adding…

udents are experimenting with circuits in their physics class and e two working circuits pictured below. The battery in each circui nd each bulb (resistor) they add provides the same amount of resi Circuit A Circuit B R1

udents are experimenting with circuits in their physics class and e two working circuits pictured below. The battery in each circui nd each bulb (resistor) they add provides the same amount of resi Circuit A Circuit B R1

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter29: Direct Current (dc) Circuits

Section29.2: Kirchhoff’s Loop Rule

Problem 29.3CE

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