Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
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Chapter 2, Problem 2.17QAP
Interpretation Introduction

(a)

Interpretation:

Time constant for the circuit should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuit and is a measure of the time required for a capacitor to charge or discharge.

Interpretation Introduction

(b)

Interpretation:

The current, voltage drops across the capacitor and the resistor during a charging cycle at given times should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuit and is a measure of the time required for a capacitor to charge or discharge.

Ohm’s law:

Ohm’s law describes the relationship among voltage, resistance, and current in a resistive series circuit.

V = IR

Connection between initial current and current across the capacitor (i) at given time during the charging is given by

i = Iinte-t/RT

The value of the voltage across the capacitor (Vc) at given time during the charging period can be given like this

Vc=Vs(1e(t/RC))

Vc = Voltage across the capacitor

Vs= Supply voltage

t = time

RC = time constant for RC circuit

Interpretation Introduction

(c)

Interpretation:

The current and voltage drops across the capacitor and the resistor during a discharging cycle at time 10 ms should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuit and is a measure of the time required for a capacitor to charge or discharge.

Ohm’s law:

Ohm’s law describes the relationship among voltage, resistance, and current in a resistive series circuit.

V = IR

The value of the voltage across the capacitor (Vc) at given time during the charging period can be given like this;

Vc=Vse(t/RC)

Vc = Voltage across the capacitor

Vs= Supply voltage

t = time

RC = time constant for RC circuit

Connection between initial current and current across the capacitor (i) at given time during the discharging is given by;

i = Iint(1-e-t/RT)

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