All Flashcards
What is resistivity ()?
Resistivity () is a material's intrinsic property that quantifies how strongly it resists the flow of electric current.
Define resistance (R).
Resistance (R) is the measure of the opposition to current flow in an electrical circuit. It is measured in ohms ((Omega)).
What is cross-sectional area (A)?
Cross-sectional area (A) is the area of a two-dimensional shape that is obtained by slicing through an object perpendicular to a specified axis. It is measured in square meters ((m^2)).
Define length (L) in the context of resistivity.
Length (L) is the distance between two points along a conductor through which current flows. It is measured in meters (m).
What are conductors?
Conductors are materials with low resistivity, allowing electric current to flow easily through them.
What are insulators?
Insulators are materials with high resistivity, hindering the flow of electric current.
Label the axes for graphing resistivity of conductive dough.
Vertical Axis: Resistance (R), Horizontal Axis: Length/Area (L/A)
What are the steps to determine resistivity experimentally?
- Mold conductive dough into cylinders of varying lengths (L) and cross-sectional areas (A). 2. Measure the resistance (R) by applying a potential difference ((Delta V)). 3. Calculate L/A for each cylinder. 4. Plot R vs. L/A. 5. The slope of the graph will give the resistivity (( ho)).
How do you determine if resistivity changes with temperature?
- Measure the resistance of the dough at different temperatures. 2. Vary the temperature using an ice bath or heat source. 3. Keep the length and cross-sectional area constant. 4. Record the temperature and corresponding resistance. 5. Plot resistance against temperature to analyze the relationship.
How to calculate resistivity ()?
- Measure the resistance (R) of the material. 2. Determine the cross-sectional area (A) of the material. 3. Measure the length (L) of the material. 4. Use the formula: