# Lesson 8 — Power and Efficiency

<p class="block-synopsis">Motors and generators, where energy is lost, and efficiency through a chain of stages.</p>

**Objectives covered**

- **1.5** — I can calculate the efficiency of a system modeled as an electrical circuit.

<div class="block-toc">
  <a class="bt-card bt-reading" href="../Block1Reading/Obj05/ECE215_Obj05_Reading.html">
    <span class="bt-kind">Reading</span>
    <h4>Power and Efficiency</h4>
    <p>The course reading for Objective 1.5.</p>
  </a>
  <a class="bt-card bt-flashcards" href="L08_Flashcards.html">
    <span class="bt-kind">Flashcards</span>
    <h4>Review deck</h4>
    <p>Key terms, equations, and ideas from this lesson, in a self-test deck.</p>
  </a>
  <a class="bt-card bt-slides" href="../_static/slides/ECE_215_Lesson08.pdf">
    <span class="bt-kind">Slides</span>
    <h4>Lesson 8 deck</h4>
    <p>The slides used in class, as a PDF.</p>
  </a>
  <a class="bt-card bt-practice" href="../downloads.html">
    <span class="bt-kind">Practice Problems</span>
    <h4>Work these before the quiz</h4>
    <p>Ungraded problems with answers, on the downloads page.</p>
  </a>
</div>