|Name of Activity
||Ohm’s Law and Series Circuits
||circuit, electricity, Ohm’s Law, voltage, resistance, current
||4, 5, 6, 7, 8, 9+
||1 Hour Total
||Students will build a simple circuit using previous knowledge about electricity. They will use Ohm’s Law to analyze the circuit.
||- To introduce electricity, circuits, and electrical engineering.
- To apply Ohm’s law to real circuits.
||- 24 Gauge AWG wire, cut to 8 inch lengths w/stripped ends. Give each student group 5 – 6 8 inch pieces.
- 9V battery with connector plate.
- 2 1-Watt light bulbs with lamp bases.
- 2 Toggle switches.
- Alligator clip.
|Preparation and Set Up:
||- Make a copy of the worksheet for each student.
- Prepare a demo circuit.
- Arrange students in groups of 2 – 3.
- Distribute materials.
||Ohm’s Law describes the relationship between the voltage, current, and resistance of a circuit. This relationship is given in the relationship Voltage = Current x Resistance. Knowing this relationship, it is possible to find any of the three values as long as the other two are known.
- Go though slides 6 – 8 of the attached Powerpoint
- Go over your demo circuit and calculate the current using Ohm’s law Current (amps) = Voltage/Resistance
- Voltage can be found on the side of a battery (9V for this activity).
- Resistance is about 81 ohms for each light bulb.
- Distribute the worksheets and materials and assist the students in creating the circuits and calculating the current using Ohm’s law.
|Extensions or Modifications:
||Design on paper a circuit of your choice, using whatever size battery and resistors you want. Calculate the Voltage, Resistance and Current in your circuit. Your teacher will show you a circuit that she or she has built. Draw a circuit diagram representing it.