Definition, with example of calculating the drift velocity current for a copper wire.

Statement of Ohm's Law with definitions of conductivity, resistance, and resistivity.

Comparison of the properties of good conductors and good insulators.

Explanation that temperature can cause Ohm's Law to break down. Includes a demonstration of Ohm's Law holding for one resistor and not for another.

Ohm's Law failing to hold for a light bulb with a resistance that varies with temperature.

Definition and comparison of values for resistance, current, and voltage.

Using a candle to increase the conductivity of air near an electroscope.

Using salt to increase the conductivity of water and light a bulb.

Calculation of resistance between body and Earth through a pair of shoes, including a demonstration that this resistance is not high enough to keep charge from flowing.

Definition and explanation of how a battery works, with examples.

Symbol for a battery in a circuit diagram, definition of electromotive force and internal resistance.

Connecting two batteries in series to demonstrate that the electromotive force doubles.

Derivation of the equation for power P=IV, including definition of Watts as unit of power.

Finding the power consumed by a resistor, with examples including light bulbs, heaters, and the human body.

Finding the power supplied by a battery, with a demonstration of a 9 V battery being shorted out.

Showing the large current and power supplied by a car battery when it is shorted out.

Finding currents and power in a circuit of batteries and resistors.

Discussion of the advantages of transporting electric energy at high voltages to minimize power loss. Calculation of the maximum voltage possible without causing corona discharge, including a slide of corona discharge on a power line during a storm.

Current I and current density J are defined, with diagrams and explanation of current flow. Conductivity and resistivity defined. Ohm's Law delta V = IR for relationship between potential and current. Symbols and sign conventions for batteries, resistors, and capacitors in circuits. Resistors in series and in parallel.

Definition, with examples of power supplied by a battery, power dissipated by a resistor, and power absorbed by a capacitor. Balance of energy in a circuit (power supplied by a battery = power dissipated by resistors + power absorbed by capacitors).

Definition of current I and current density J, with diagrams and equations. Statement of microscopic Ohm's Law.

Definition of electromotive force. Statement of Kirchhoff's rules. Step-by-step method for solving DC circuit problems. Equations for resistance, power, and resistors in series and in parallel.

Definition from E-field; car batteries; direction of current flow.

Using Kirchhoff's rules to solve complex circuits; internal resistance and power dissipation.

Current as dQ/dt; current density and velocity; conductivity.

Microscopic and macroscopic Ohm's Law; resistance and resistivity; power dissipation.

Strategy for resistance and resistivity; resistance for cable, cone, hollow cylinder; charge at a junction.

Question with answer and explanation.

Four questions about current and power in simple circuits of batteries and lightbulbs, with answers and explanations.

5-part power problem; finding resistance, power, voltage conditions, and Lorentz force in power lines.

Solution (PDF)

5-part problem; determining which bulbs in a circuit are lit when various switches are closed and which are brightest.

Solution (PDF)

Determining relative brightness of light bulbs in a resistor circuit.

Solution (PDF)^#