Chapter 17: Electric Current, resistance & power


Objective(s)

  1. Students should understand the definition of electric current, so they can relate the magnitude and direction of the current to the rate of flow of positive and negative charge.
  2. Students should understand conductivity, resistivity, and resistance, so they can:
  • Relate current and voltage for a resistor.
  • Describe how the resistance of a resistor depends upon its length and cross-sectional area, and apply this result in comparing current flow in resistors of different material or different geometry.
  • Apply the relationships for the rate of heat production in a resistor.

Study guide - title

Section 1: Batteries and direct current


Tutorial (Univ. of California) - Current, resistance & Power

Virtual lab (PhET @ Colorado) - Battery voltage

Virtual lab (PhET @ Colorado) - Battery-resistor circuit

Video (MIT) - Batteries & EMF

Project - Making a battery

Section 2: Current and drift velocity


Virtual lab (PhET @ Colorado) - Conductivity

Video (You tube) - Stan Lee Superhuman: Human Conductor

Video (You tube) - High voltage cable inspectors

Website - Conventional vs. electron flow

Video - Current and voltage


Section 3: Resistance and Ohm's law


Tutorial (Univ. of California) - Current, resistance & Power

Virtual lab (PhET @ Colorado) - Resistance in a wire

Virtual lab (PhET @ Colorado) - Ohm's law

Video (MIT) - Current, resistivity & Ohm's law




Section 4: Electric Power


Tutorial (Univ. of California) - Current, resistance & Power

Video (The Mechanical Universe) - Episode 32: The electric battery









Tutorial (Univ. of California) - DC circuits with batteries and resistors

Tutorial (Univ. of California) - Capacitors in circuits

Mini lab - title

AP lab - title

Virtual lab (PhET @ Colorado) - DC Circuit construction kit


Virtual lab (PhET @ Colorado) - Semiconductors


Video (Eureka) - title


Video (MIT) - Transformers, car coils and RC circuits


Video (The Mechanical Universe) - Episode 33: Electric circuits


Video (Khan Academy) - Circuits (Part 1)
  • Introduction to electricity, circuits, current and resistance


Video (Khan Academy) - Circuits (Part 2)
  • Resistors in series

Video (Khan Academy) - Circuits (Part 3)
  • Resistors in parallel

Video (Khan Academy) - Circuits (Part 4)
  • A hairy resistance problem