Chapter 21, Problem 55QAP

Interpretation Introduction

Interpretation:

To determine consumed electrical energy in kilojoules.

Concept introduction:

Faraday’s constant (F) is defined as charge in Coulomb of 1 mole electron.

$\text{F}=9\cdot 648\times {10}^4\text{C}$

Value of Faraday’s constant is product charge of one electron with Avogadro’s number.

$\begin{array}{c}\text{F=Charge}\text{of}\text{one}\text{electron×Avogadro’s}\text{number}\\ \text{=1}\text{.602}\times {\text{10}}^{-19}\text{C}\times \text{6}\text{.022}\times {\text{10}}^{23}\\ =9.648\times {10}^4\text{C}\end{array}$

Hence, $1\text{F}=9.648\times {10}^4\text{C}$

Relation of electrical energy with charge and voltage is,

$E=QV$

Where, E is electrical energy, Q is charge and V is voltage