Transcript Lab 1: Introduction to Electrical Systems

OBJECTIVES
1. Create correctly sized connectivity cabling.
2. Demonstrate proper crimping techniques for attaching crimp connectors
to cabling.
3. Configure and properly connect a hand held multimeter to perform
voltage measurements in a circuit.
4. Configure and properly connect a hand held multimeter to perform
resistance and continuity measurements in a circuit – including circuit
preparations associated with taking these measurements.
5. Configure and properly connect a hand held multimeter to perform
current flow measurements in a circuit – including circuit preparations
associated with taking these measurements.
6. Identify common color code for crimp connectors designed to work with
different AWG wire sizes.
7. Determine the capabilities of DC sources created by wiring multiple
voltage sources in series with each other.
8. Determine the capabilities of DC sources created by wiring multiple
voltage sources in parallel with each other.
(continued)
OBJECTIVES (CONTINUED)
9. Describe how power consumption is different in AC and DC circuits.
10. Determine which type of power rating is used to determine wire sizes and
fusing values for AC circuits.
11. Employ Ohms Law to determine the level of current flowing in a circuit
given supply voltage and load resistance.
12. Given a load device with resistance and current requirements, use Ohms
Law to determine the size of the voltage source required to meet the
specifications.
RESOURCES
1. Crimp connectors
2. 18 AWG wire (red and black)
3. Crimp tool
4. 12V Battery Battery Pack (4)
5. Hand-Held Digital multimeter
6. Marcraft GT-1000 Solar PV Technology Panel
Figure 1-1: Proper Insertion of a Crimp Connector
into the Crimp Tool
Figure 1-2: The Internal Metal Seam in the Crimp
Connector
Crimp connectors are color coded according
to the wire gauge they are designed to work
with. Common crimp connector color codes
are:
Wire sizes between AWG#22 and AWG#18
use Red connectors
Wire size between AWG#16 to AWG#14 use
Blue connectors
Wire size between AWG#12 to AWG#10 use
Yellow connectors
Figure 1-3: Stripping Wire with Squeeze-Handle
or Pliers-Style Strippers
NOTE
Pliers-style strippers provide one
fixed position for each wire gauge.
Figure 1-4: Crimping the Female Spade Connector
Figure 1-5: Completed Wiring Harnesses
CAUTION
Be sure not to connect the wires to the
battery until everything else has been
completed and you are instructed to do
so in this procedure.
Figure 1-6: Identifying Batteries
Figure 1-7: Connecting Batteries in Series
Figure 1-8: Connecting Batteries in Parallel
Figure 1-9: Two Sets of Series Connected Batteries
Figure 1-10: Connecting Batteries in Series/Parallel
WARNING
Power off - Unlike the voltage check,
resistance checks are always made with
power removed from the system.
Figure 1-11: Meter Leads Set for Measuring Continuity
Figure 1-12: Meter Leads Set for Measuring Continuity
Figure 1-13: Measuring Resistance of the Diverter
Overflow Light
Figure 1-14: Measuring Current
Figure 1-15: Connecting the Red Battery Wire
Figure 1-16: Connecting the Series/Parallel Battery
Wiring Scheme
LAB QUESTIONS
1
What type of tool should be used for
crimping single conductor, multi-strand
wiring below AWG10?
LAB QUESTIONS
2
What is the proper method for
creating a crimp connection?
LAB QUESTIONS
3
What is the result of inserting a
crimp connector into the crimp tool
facing the wrong way?
LAB QUESTIONS
4
What color are crimp connectors
designed for use on wire sizes from
AWG#16 to AWG#14?
LAB QUESTIONS
5
What should be done to keep any
stray strands together in a neat,
orderly fashion?
LAB QUESTIONS
6
How many batteries are used in this
procedure, and what are their
voltage values?
LAB QUESTIONS
7
What should the multimeter setting
be in order to measure the voltage
level of each battery?
LAB QUESTIONS
8
What was the total voltage measured
across battery #1 and battery #2
connected in series?
LAB QUESTIONS
9
What was the total voltage measured
across battery #3 and battery #4
connected in parallel?
LAB QUESTIONS
10 What was the total voltage measured
across battery #1/#3 and battery
#2/#4 connected in series/parallel?
LAB QUESTIONS
11 What is another name for the
measurement of resistance?
LAB QUESTIONS
12 Why must resistance measurements
be conducted only after power to the
circuit under test has been removed?
LAB QUESTIONS
13 What must be done to electrically
isolate the component being tested
for continuity from the system?
LAB QUESTIONS
14 What is the resistance reading for
a bad fuse?
LAB QUESTIONS
15 What is the proper range setting
for a multimeter being used to
check continuity?
LAB QUESTIONS
16 When measuring current, how
must the multimeter be connected?
LAB QUESTIONS
17 Reversing the multimeter’s leads
when measuring current resulted
in what changes in outcomes?
LAB QUESTIONS
18 What is the total voltage supplied to
the motor circuit by the batteries?
LAB QUESTIONS
19 How much current leaving the
battery pack must travel through
the multimeter?
LAB QUESTIONS
20 When setting up the circuit, where
did the multimeter’s red measuring
lead connect?