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INSTRUCTOR
• Next Week– DC Theory: Lesson 22
• Understanding Resistance in DC Combination Circuits
– Combination Circuits• Require the use of earlier skills
– Series Resistors– Parallel Resistors
• May be solved using skill which you already have demonstrated
– Example
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INSTRUCTOR
RT = ?
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INSTRUCTOR
RT = ?
Assume R1 = 0 Ω
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INSTRUCTOR
RT = ?
New Circuit
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INSTRUCTOR
RT = 2,000 x 2,000 = 1,000 Ω2,000 + 2,000
Solve for R2 and R3 in ParallelRT = (R2 x R3) / (R2 + R3)
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INSTRUCTOR
RT = ?
Add R1 back into the circuit
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INSTRUCTOR
RT = 1,000 + 1,000 = 2,000 Ω
Solve R1 and R23 in SeriesRT = R1 + R23
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INSTRUCTOR
Prove the calculation by removing the Power Source
and measuring the resistance in the original
combination circuit
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• Reminder:– Next Class Assignment: DC Theory Lesson 22– HINT: Use the simulator to verify quizzes– Homework is due Sunday before 8:00 PM– If you have questions, you may email me
before Friday at 9:00 PM and I will respond to all emails within 24 hours. ( [email protected] )
INSTRUCTOR
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Bill is an Apprentice
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13INSTRUCTOR
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14INSTRUCTOR
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Bill is an Apprentice
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16INSTRUCTOR
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17INSTRUCTOR
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18INSTRUCTOR
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19INSTRUCTOR
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23INSTRUCTOR
LESSON 22Question 9 – 68%Question 15 – 72%Question 19 – 64%Question 21 – 72%Question 22 – 60%Question 23 – 68%Question 24 – 64%Question 26 – 68%Question 27 – 72%Question 28 – 72%Question 29 – 44%
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24INSTRUCTOR
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27INSTRUCTOR
Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
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28INSTRUCTOR
Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
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29INSTRUCTOR
Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
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30
Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
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Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
INSTRUCTOR
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Let’s examine these questions to see what we need to cover in class
Q9Q15Q19Q21Q22Q23Q24Q26Q27Q28Q29
INSTRUCTOR
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33INSTRUCTOR
• In the classroom:• Several Apprentices understand how to do
combination circuits so I will have those apprentices work quietly in two groups on some advanced problems.
• I will have the groups compete to see which group can solve the problems quicker.
• The remainder of the Apprentices understand the theory but have problems reducing problems to equivalent circuits.
• They have been able to follow lesson instructions in the past so I think the reduction process is the issue
• First I will review the process• Then I will demonstrate again using the simulator• Finally, I will give them hands-on problems in the
simulator and make them prove each calculation using the meter
Bill is a Training Director