WHAT MAKES A LIGHT BULB LIGHT?

SECTION ONE: Identifying standards and objectives

Essential Elements of Inquiry:

PA Academic Standards for Science and Technology:

3.2.4.C. Recognize and use the elements of scientific inquiry to solve problems.

3.4.4.B. Know the basic energy types, sources, and conversions.

PA Academic Standards for Environment and Ecology:

PA Academic Standards for RWLS:

PA Academic Standards for Math:

Enduring Understandings:

A complete electrical circuit is required to make a light bulb light!

What is an electrical circuit?

An electrical circuit is a closed loop of "conducting " material in which electrical charges can move. Each charge is an electron, which moves through good conductors of electricity such as metals. Charges moving in the same general direction within a circuit is a current. This can be made with a copper wire, a battery, and a light bulb connected to form a closed loop or complete circuit. Charges need a "push" to move them in the same general direction to produce a current. This push is provided by a battery.

What is a battery?

A battery provides the energy of motion needed to make a light bulb glow. The energy released by chemical reactions within the battery is transferred to the light bulb as energy of motion carried by electrons. In the battery, chemical energy is stored in the bonds between the atoms of certain chemicals. A chemical reaction that breaks these bonds and releases energy results in the push that causes the electrical current. As long as the chemical reaction in the battery continues and the circuit remains closed, there will be a current. After all of the chemicals in the battery have undergone the chemical reaction, the battery is dead and the current stops.

What is a light bulb?

The glass part of the light bulb is a casing for a thin wire called a filament. Most of the air is removed from the bulb and replaced with an oxygen-free gas (inert) to prevent the filament from oxidizing (burning up) when it gets hot and glows. The filament is also part of the closed circuit. One end is connected to the little bump at the bottom of the light bulb and the other is connected to the bulbís threaded metal base. The filament is made of thin tungsten and resists the flow of current far more than metal wire of ordinary thickness, thus leading to glowing. The filament causes the electronsí moving in one general direction to have more random motion, which produces the light. In summary, the resistance due to the filamentís thinness acts to convert the electrical energy in the current into the energy of light.

How does an electrical circuit make a light bulb light?

USE DIAGRAM AS A SUMMARY! (see Kate Sillman: kas132@psu.edu)

Essential Questions:

What is an electrical circuit?

What is a battery?

What is a light bulb?

How does an electrical circuit make a light bulb light?

Performance standards:

To meet the standards, students will be able to:

SECTION TWO: Identifying assessment

Pre-Assessment: Checking for prior knowledge

Formative:

Summative:

Refer to the question and student responses. Score the student responses using the rubric below, then compare to the generally accepted responses.

Erik SCORING RUBRIC: (see ERIK packet)

SECTION THREE: Identifying lesson activities

Materials (per student):

ENGAGE: Learners become interested, raise questions, and focus attention on target concepts.

EXPLORE: Learners interact with materials and each other.

EXPLAIN: Learners develop explanations that represent their understandings of target concepts.

ELABORATE: Learners apply understandings to a new situation.

EVALUATE: Learners review and assess what they have learned and how they have learned it.

SECTION FOUR: Lesson analysis