What is the current read by the ammeter in the circuit below? Let R1 = 1 kiloohm, R2 = 2 kiloohm, R3 = 3 kiloohm, and the emf of the ideal source is 5 volts. Input R1, R2, and R3 for resistors R1, R2, and R3 respectively. Input E for the emf '. Use context clues to figure out if you need to input a numerical value, variable, word, etc. All numerical answers should be in three significant figures. R1 R2 R3 (A First we calculate the current across each resistor. From Ohm's law, we arrive at a general formula for current: I= Plugging in values, the current across the resistor R1 is equal to: (Please note that the current is in milliamperes) 11= mA Similarly the current across R2 is: 12= And the current across R3 is: 13= mA

What is the current read by the ammeter in the circuit below? Let R1 = 1 kiloohm, R2 = 2 kiloohm, R3 = 3 kiloohm, and the emf of the ideal source is 5 volts. Input R1, R2, and R3 for resistors R1, R2, and R3 respectively. Input E for the emf '. Use context clues to figure out if you need to input a numerical value, variable, word, etc. All numerical answers should be in three significant figures. R1 R2 R3 (A First we calculate the current across each resistor. From Ohm's law, we arrive at a general formula for current: I= Plugging in values, the current across the resistor R1 is equal to: (Please note that the current is in milliamperes) 11= mA Similarly the current across R2 is: 12= And the current across R3 is: 13= mA

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter23: Series And Parallel Circuits

Section23.1: Simple Circuits

Problem 7PP

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Question

What is the current read by the ammeter in the circuit below? Let R1 = 1 kiloohm, R2 = 2
kiloohm, R3 = 3 kiloohm, and the emf of the ideal source is 5 volts.
Input R1, R2, and R3 for resistors R1, R2, and R3 respectively. Input E for the emf '. Use
context clues to figure out if you need to input a numerical value, variable, word, etc. All
numerical answers should be in three significant figures.
R1
R2
R3
(A
First we calculate the current across each resistor. From Ohm's law, we arrive at a general formula for
current:
I=
Plugging in values, the current across the resistor R1 is equal to: (Please note that the current is
in milliamperes)
11=
mA
Similarly the current across R2 is:
12=
And the current across R3 is:
13=
mA

The current read by the ammeter is the sum of the currents across each resistor:
l=11+12+13
mA
Alternatively, we can solve for the current across the ammeter by first calculating the equivalent
resistance and then applying Ohm's law.
The equivalent resistance of the three resistors in parallel is:
1/Re =1/R, +1/R2 + 1/
Thus,
Ω
Req=

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