| Assignment Date: Grade: MYP 5 Due Date: Criterion: B Topic: Electricity Subject: Physics Teacher: Sumit Bhatnagar Student: |
Ohm’s law states the relationship between current through a conductor between two points and the voltage across them. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship
I = V/R
where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm’s law states that the R in this relation is constant, independent of the current. Ohm’s law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current. However, some materials do not obey Ohm’s law, these are called non-ohmic.
Perform an experiment using the link given below in a virtual lab. Select the conductor of a particular resistance, vary the potential difference across the conductor and take the readings that ammeter shows. By calculating the resistance for each and every reading, verify the Ohm’s law. Use the simulation given below:
https://phet.colorado.edu/en/simulation/ohms-law
Based on the background information given above, design an investigation to interpret the variation of potential difference with respect to the change in electric current.
