Question

Three ammeters are located near junction $P$ in a direct current circuit as shown in the diagram below. If ammeter $A_{1}$ reads 3 amperes and ammeter $A_{2}$ reads 4 amperes, what does ammeter $A_{3}$ read? (A) $5 \mathrm{~A}$ (B) $7 \mathrm{~A}$ (C) $3 \mathrm{~A}$ (D) $8 \mathrm{~A}$

Name: Problem 15, Chapter 9: Let's Review Regents: Physics—Physical Setting
Uploaded: 2022-01-23T00:59:07-08:00
Duration: 2 min 24 s
Channel: Rachel B.
Description: Three ammeters are located near junction P in a direct current circuit as shown in the diagram below. If ammeter A1 reads 3 amperes and ammeter A2 reads 4 amperes, what does ammeter A3 read? (A) 5 A (B) 7 A (C) 3 A (D) 8 A

   Three ammeters are located near junction $P$ in a direct current circuit as shown in the diagram below. If ammeter $A_{1}$ reads 3 amperes and ammeter $A_{2}$ reads 4 amperes, what does ammeter $A_{3}$ read?
(A) $5 \mathrm{~A}$
(B) $7 \mathrm{~A}$
(C) $3 \mathrm{~A}$
(D) $8 \mathrm{~A}$

Let's Review Regents: Physics—Physical Setting

Miriam A. Lazar 1st Edition

Chapter 9, Problem 15

Instant Answer

Solved by Expert Rachel B.

01/23/2022

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This means that the sum of currents flowing into the junction is equal to the sum of currents flowing out of the junction. Show more…

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Three ammeters are located near junction $P$ in a direct current circuit as shown in the diagram below. If ammeter $A_{1}$ reads 3 amperes and ammeter $A_{2}$ reads 4 amperes, what does ammeter $A_{3}$ read? (A) $5 \mathrm{~A}$ (B) $7 \mathrm{~A}$ (C) $3 \mathrm{~A}$ (D) $8 \mathrm{~A}$

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Key Concepts

Kirchhoff's Current Law

A fundamental principle in circuit analysis stating that the sum of all currents entering a junction (or node) must equal the sum of all currents leaving the junction. This law is used to analyze complex circuits and determine unknown current values by ensuring the conservation of current at any junction.

Conservation of Charge

This is the principle underlying Kirchhoff's Current Law, which asserts that electric charge is neither created nor destroyed in an electrical circuit. In practice, this means that the amount of charge per unit time (current) flowing into a junction must be exactly balanced by the current flowing out.

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