## Photos from The Physics Classroom's Flickr Group

### Lesson 1: Electric Potential Difference

Lesson 1 develops the concept of electric potential difference between two locations and applies the concept to simple circuits. Items in the group's pool include photos of voltmeters, dry cells, 9-volt batteries, diagrams of equipotential lines, diagrams of Galvani's experiments with frog legs, and much more. Photos complement many of the discussions from Lesson 1 of the Current Electricity chapter of The Physics Classroom Tutorial.

### Lesson 2: Electric Current

Lesson 2 discusses the requirements for an electric circuit, the conceptual and mathematical meaning of current, common misconceptions regarding circuits and electric power. Items in the group's pool include photos of light bulb filaments, electrical meters, cartoons, and simple circuits composed of cells, light bulbs and wires. Photos complement many of the discussions from Lesson 2 of the Current Electricity chapter of The Physics Classroom Tutorial.

### Lesson 3: Electrical Resistance

Lesson 3 discusses the concept of electrical resistance, Ohm's law and the relationship between electrical resistance and power. Items in the group's pool include photos of resistors, light bulb filaments, electrical pylons, cartoons and much more. Photos complement many of the discussions from Lesson 3 of the Current Electricity chapter of The Physics Classroom Tutorial.

### Lesson 4: Circuit Connections

Lesson 4 discusses the concepts and mathematics associated with series, parallel and combination circuits and the use of circuit diagrams to represent each. Items in the group's pool include photos of simple circuits, circuit boards, electrical components found in circuits, and much more. Photos complement many of the discussions from Lesson 4 of the Current Electricity chapter of The Physics Classroom Tutorial.