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