Definition 25.8.1. Resistance.
Circuit elements present obstacles to the flow of electric current in circuits, which we define as Resistance and we write as \(R\text{.}\) Resistance is measured in units of Ohms (\(\Omega\)).
Section 25.8 Resistance
Resistance in circuits arises in the form of a resistor. Resistors are elements commonly seen in circuits, and can alter how current flows and provide a voltage drop. The energy lost across a resistor is dissipated in the form of heat. Resistors will be discussed in more detail in an upcoming section.
Exercises Activities
Shown below is a circuit with three resistors. In a circuit diagram, a resistor is represented by a jagged line.
1.
Assume that \(R_1 > R_2\text{.}\) Predict whether the current through resistor 2 greater than, less than, or equal to the current through resistor 1. Explain your answer.
2.
Predict whether the voltage across resistor 2 is greater than, less than, or equal to the voltage across resistor 1. Explain your answer.
