Lab #3 – Resistor CircuitsPurpose of today’s lab:● To measure the electric current and voltage, and find their relationship in simpleresistor circuits.Required equipment and parts:● Resistor circuit box● Multimeter● Vernier ammeter and Logger-Pro data acquisition software● Power supplyBackground: The flow of charge is called current. We measure current in units ofcharge per second. One Coulomb per second is equal to one "Ampere" (or "Amp" forshort), the standard unit of current.Consider the circuit shown below. R is a resistor, V is a voltmeter (to measure thevoltage difference V across the resistor), A is an ammeter (to measure the current Ithat flows around the circuit) and R is the resistance of the resistor. No current flowsthrough the voltmeter, so the measured current, I, also flows through the resistor.Voltage V is in volts (V), current I is in amperes (A), and the unit for resistance R is an"Ohm" (abbreviated with an "Ω".) In this experiment we vary the current through aresistor R, and measure the corresponding voltage difference across the resistor.                 Like the capacitors last week, we can combine resistors in series and in parallel:SERIES PARALLELWhen resistors are combined in this manner, the total combination has an "equivalentresistance", as shown in the bottom part of the above figure. The values of theequivalent resistance for series and parallel are as follows:Series: R s = R 1 + R2 Parallel: 1/Rp = 1/R1 + 1/R2 (2)1. Experimental Set-Up:● Select the "Ω" button on the multimeter so that it will measure resistance.(Make sure you use the correct inputs to measure resistance!)● Connect two banana-plug wires to the multimeter, and connect the other endsof these wires to each other. Select the "NULL" function on the multimeter. Thisis like selecting "zero" on a digital scale; it sets the present resistance readingto zero, so that future measurements will subtract out the resistance of thewires themselves.● Now disconnect the ends and use the wires to measure the expected value ofresistance of each resistor in your set-up (R expect ± δR expect, R expect ± δR expect).Choose two resistors to measure using the multimeter. Record these values foryour Data section, and be sure to keep track of which value goes with whichresistor. (Caution: One of your components is a diode, not a resistor, and is notused for this laboratory. You can tell the resistors by the colored coded bandson them that indicate their nominal resistance)● On the computer (log in using your sjsu email address and password), go tothe desktop and select "Logger Pro"; when this program runs, it should1 1 2 2                      Plese give a abstract,  material and methos, and conclusion

Lab #3 – Resistor Circuits
Purpose of today’s lab:
● To measure the electric current and voltage, and find their relationship in simple
resistor circuits.
Required equipment and parts:
● Resistor circuit box
● Multimeter
● Vernier ammeter and Logger-Pro data acquisition software
● Power supply
Background: The flow of charge is called current. We measure current in units of
charge per second. One Coulomb per second is equal to one "Ampere" (or "Amp" for
short), the standard unit of current.
Consider the circuit shown below. R is a resistor, V is a voltmeter (to measure the
voltage difference V across the resistor), A is an ammeter (to measure the current I
that flows around the circuit) and R is the resistance of the resistor. No current flows
through the voltmeter, so the measured current, I, also flows through the resistor.
Voltage V is in volts (V), current I is in amperes (A), and the unit for resistance R is an
"Ohm" (abbreviated with an "Ω".) In this experiment we vary the current through a
resistor R, and measure the corresponding voltage difference across the resistor.

 

Like the capacitors last week, we can combine resistors in series and in parallel:
SERIES PARALLEL
When resistors are combined in this manner, the total combination has an "equivalent
resistance", as shown in the bottom part of the above figure. The values of the
equivalent resistance for series and parallel are as follows:
Series: R s = R 1 + R2 Parallel: 1/Rp = 1/R1 + 1/R2 (2)
1. Experimental Set-Up:
● Select the "Ω" button on the multimeter so that it will measure resistance.
(Make sure you use the correct inputs to measure resistance!)
● Connect two banana-plug wires to the multimeter, and connect the other ends
of these wires to each other. Select the "NULL" function on the multimeter. This
is like selecting "zero" on a digital scale; it sets the present resistance reading
to zero, so that future measurements will subtract out the resistance of the
wires themselves.
● Now disconnect the ends and use the wires to measure the expected value of
resistance of each resistor in your set-up (R expect ± δR expect, R expect ± δR expect).
Choose two resistors to measure using the multimeter. Record these values for
your Data section, and be sure to keep track of which value goes with which
resistor. (Caution: One of your components is a diode, not a resistor, and is not
used for this laboratory. You can tell the resistors by the colored coded bands
on them that indicate their nominal resistance)
● On the computer (log in using your sjsu email address and password), go to
the desktop and select "Logger Pro"; when this program runs, it should
1 1 2 2

 

 

 

     Plese give a abstract,  material and methos, and conclusion