LE LEGGI DI OHM Misurare V, i ed R Esercizi su Resistenze in serie e in parallelo Lezione tratta dal sito http://ocw.mit.edu/ Del Massachussets Institute of Tecnology Dal corso di Fisica 2

Classe 5^ C LST I.T.T. “Tito Sarrocchi” Siena a.s. 2011-2012 Hour 1: Working with Circuits Expt. 4. Part I: Measuring V, I, R

Last Time: Resistors & Ohm’s Law

Last time

Measuring Voltage & Current

Measuring Potential Difference A voltmeter must be hooked in parallel across the element you want to measure the potential difference across Voltmeters have a very large resistance, so that they don’t affect the circuit too much

Measuring Current A ammeter must be hooked in series with the element you want to measure the current through Ammeters have a very low resistance, so that they don’t affect the circuit too much

Measuring Resistance An Ohmmeter must be hooked in parallel across the element you want to measure the resistance of Ohmmeters apply a voltage and measure the current that flows. They typically don’t work if the resistor is powered (connected to a battery)

EXERCISES

Exercise 1

Exercise 2

Exercise 3

Exercise 4

Exercise 5