### Lesson Focus

Demonstrate Ohm’s Law using digital multi-meters. Fun hands-on activities are presented that demonstrate Ohm’s Law. Teachers use digital multi-meters to collect data that are plotted to show that voltage and current are related by linear functions for ordinary resistors and by power functions for light bulbs.

10 – 18

### Objectives

Learn about Ohm’s Law. Be able to use a digital multi-meter to collect data. Explore the concepts of voltage and current.

### Anticipated Learner Outcomes

As a result of the activities, students should develop an understanding of:

• Ohm’s Law
• Relationship between Voltage, Current, and Resistance in an electrical circuit
• Measurement, plotting data, and graphing
• Basic wiring and construction of a digital multi-meter for data collection

### Lesson Activities

The activity consists of using a nominal six-volt battery (made up of four nominal 1.5 volt dry cells connected in series) to:

• Drive current through a simple circuit element and measure and record the current through the element and the voltage across the element as the number of cells in the battery is varied from a single cell to four cells.
• Plot points on the graph that represent the voltages and currents recorded.
• Draw a “best fit” curve through the data points for the element tested.
• Repeat the process for two or three different resistor circuit elements.
• Compare the curves and make observations about the nature of the curves for each element.

Six teacher handouts are provided:

• Ohm’s Law Information Sheet
• Step By Step Lesson Plan Guidelines
• Appendix 1: Materials Sourcing Suggestions
• Appendix 2: Continuity Tester Assembly Instructions
• Appendix 3: Alternate Single Cell Battery Holder Photos and Diagrams
• Appendix 4: Optional Insulators and Conductors Activity

Two student handouts are provided for advance review:

• Ohm’s Law Information Sheet
• Step By Step Procedures

### Resources/Materials

See attached student worksheets and teacher resource documents.

### Alignment to Curriculum Frameworks

Curriculum alignment sheet is included in PDF.