LE LEGGI DI OHM Misurare V, i ed R Esercizi su Resistenze in serie e in parallelo

1
LE LEGGI DI OHMMisurare V, i ed REsercizi
suResistenze in serie e in parallelo

• Lezione tratta dal sito http//ocw.mit.edu/
• Del Massachussets Institute of Tecnology
• Dal corso di Fisica 2

2
Classe 5 C LSTI.T.T. Tito Sarrocchi
Sienaa.s. 2011-2012

• Hour 1
• Working with Circuits
• Expt. 4. Part I Measuring V, I, R

3

• Last Time
• Resistors Ohms Law

4
Last time
5

• Measuring Voltage Current

6
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 dont affect the circuit too much
7
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
dont affect the circuit too much
8
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 dont work if the
resistor is powered (connected to a battery)
9
EXERCISES
10
Exercise 1
11
Exercise 2
12
Exercise 3
13
Exercise 4
14
Exercise 5