You will demonstrate how the total resistance of a circuit increases when resistors are in series and decreases when resistors are in parallel.
Review your students’ sketches, assessing their schematic drawings and the accuracy of the data they recorded during the demonstrations. The answers for voltage and current data will vary according to how you conduct your demonstration, and depending on the charges in the dry cells.
Any electrical component with electrical resistance restricts the flow of electrons in a circuit and transforms electrical energy into other forms of energy.
A resistor is an electrical component with a specific resistance value. Resistors can be used to control current or to provide a specific voltage and current to other components in a circuit.
Resistor codes and values
Students must understand how resistors are classified. For series circuits, if the resistors have the same resistance value, the voltage drop in each resistor will be the same. For parallel circuits, the current will be the same through each resistor, although each will be half of the total current. Using resistors with different values emphasizes how the voltage and current change in series and parallel circuits.
Students should be able to recognize the following relationships emerging from the data collected during their investigations: