Read about energy efficiency facts and do the exercise in your notebooks.<p><img src="@@PLUGINFILE@@/Alternative%20-Elective%20reading.PNG" alt="" width="437" height="582" role="presentation" class="img-responsive atto_image_button_text-bottom"><br></p><p><img src="@@PLUGINFILE@@/Alternative%202.PNG" alt="" width="428" height="569" role="presentation" class="img-responsive atto_image_button_text-bottom"><br></p>