## Chapter 27: Currents and Ohm’s Law

### Study Plan

As we learn about current and resistance in this chapter, we can consider such questions as:

• For a known current, how much total charge flows in a given amount of time? (Examples 1 and 2, pages 860-861)
• How is the resistance of a piece of cable measured? (Example 3, page 861)
• How does the resistance of a piece of wire change with temperature? (Example 6, Section 27.3, page 877 and page 870)
• How do we decide if it is safe to plug several appliances into the same outlet? (Example 10, page 869)

#### Organize

1. Prepare for lecture by reading the assigned sections from Chapter 27 in your textbook or ebook. This will provide an organizing framework for concepts introduced in lecture, and help you take better notes.
2. Take the checkup quiz and work the Checkup questions in your textbook to assess your understanding of basic concepts. Take note of any topics you need to review further.
3. Review the Examples from your textbook. These progress from simple to complex, and provide concrete illustrations of the concepts discussed.
4. Review the Problem Solving Techniques box on Combinations of Resistors from your textbook.

#### Learn

2. Access the Online Concept Tutorials given for this chapter. Tutorials use animation and interactive exercises to help develop your understanding of fundamental topics.
Superconductors
Sections: 27.3, 31.1, 31.4
The interactive questions in this Online Concept Tutorial anticipate material introduced in Chapter 31.
3. Use the FlashCards to test your memory for new key terms and equations.
4. Work the end of chapter Problems and Review Problems assigned by your instructor. If your instructor has assigned SmartWork online homework, login from the right navigation pane.

#### Connect

1. Physics in the News offers additional real-world physics applications, and a daily dose of science-based news.