Extech Instruments MT310 Instrukcja Użytkownika

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P31220 Lab
1
Ohm’s Law and DC Circuits
Purpose: Students will become familiar with DC potentiometers circuits and Ohm’s Law.
Introduction:
Ohm’s Law for electrical resistance, V = IR, states the relationship between current, voltage,
and electrical resistance. If R is constant, V is proportional to I. However, the resistance of a
device can’t always be assumed to be a constant. If you did the “Properties of Resistors” lab,
you might recall that electrical resistance varies with temperature. Diodes are designed to
conduct electricity in only one direction, and thermistors are designed to be especially sensitive
to temperature. Batteries have an internal resistance that is a consequence of the internal
chemistry of the battery. Chemical reactions in the battery cause the internal resistance to
increase. Batteries go “dead” not because they lose voltage, but because their internal resistance
increases to the point where current can no longer flow.
In this lab, you will observe how Ohm’s Law works, you’ll learn about voltage dividers, and
you’ll learn how to measure the internal resistance of a battery.
About Voltmeters, Ammeters, and Ohmmeters:
The table below summarizes the important characteristics of meters and how to connect them so
that the meter has a minimal effect on the circuit. The “resistor” in the table could be any circuit
element with resistance, such as an actual resistor, a light bulb, a motor, a diode, etc. The DMM
can be used as an ammeter, voltmeter, or ohmmeter. It is important to understand that Ammeters
have very small resistance, and Voltmeters have very large resistance. Ohmmeters basically are
voltmeters that use a known voltage from a battery inside the meter, and therefore should not be
used when other voltages are present.
Meter
Measures
Meter’s
own
resistance
Connected to
circuit
element
Circuit Diagram
Circuit is
Voltmeter
Voltage
“across”
resistor
very big
In Parallel
ON
Ammeter
Current
“through”
resistor
very
small
In Series
ON
Ohmmeter
Resistance
”of”
resistor
Big. Uses
its own
battery
In Parallel
Element is
disconnected
OFF and
disconnected
V
A
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Podsumowanie treści

Strona 1 - Ohm’s Law and DC Circuits

P31220 Lab 1 Ohm’s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm’s Law. Introduction: Ohm’s L

Strona 2 - Multimeter (DMM)

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

Strona 3

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

Strona 4

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

Strona 5

P31220 Lab 2 Using the DMM’s: You will be using two DMM’s (Digital Multimeters) in this lab. One of these will be used as a voltmeter, and the other

Strona 6 - Clean-Up:

P31220 Lab 3 Experiment 1: Find the internal resistance of a Battery (15 minutes) You have a 9V battery. Use the DMM to measure its voltage. There

Strona 7

P31220 Lab 4 Experiment 3: Building the Potentiometer Circuit (5 minutes) If you did the “Properties of Resistors” lab, you might recall that the lo

Strona 8

P31220 Lab 5 Experiment 4: Measuring Resistance as a Function of Voltage Now, things get a little more interesting. Carbon resistors, light bulbs,

Strona 9

P31220 Lab 6 General instructions:  Record your data in the data table at the end of the lab. You do not have to fill in all of the boxes. Extra ro

Strona 10

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

Strona 11

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

Strona 12 -  V vs. I for a diode

P31220 Lab Name: ________________________________ Lab Section: ________________ T.A.’s ____________________________________________ Today’s Lab P

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