Check Operation of Electrical Circuits Using Fused Jumper Wires

Lesson Plan for

AUT 154-155 Maintenance and Light Repair Section C

Course HS Title: / Maintenance and Light Repair / Program:
KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.)
KCTCS Course No. / KCTCS Course Title
Introduction/Context / This lesson will instruct students on how to properly check operation of electrical circuits using fused jumpers wires.
Prepared By / School / Date:
Grade Level / No. Students / No.IEP's: / Lesson Length:
Task
Check Operation of electrical circuits using fused jumper wires
No. / Objective
1 / Upon completion of this lesson, the student will be to able check operation of electrical circuits using fused jumper wires and pass a written exam on the task with 100% accuracy by the end of the course.

Connections:

Skills Standards:
OH 001
OH 002
OH 003
OD 002
OD 003
OD 005
New Common Core Standards:
RST 11-12 3
Common Core Technical Standards:
TD-OPS 2
TD-SYS 2
New Generation Science Standards:
HS-PS2-5.
HS-PS3-3.
HS-PS3-5.

INSTRUCTIONAL MATERIALS/TECHNOLOGY
Textbooks and Workbooks

Author / Title/ISBN No. / Edition / Publisher / Pages
James E. Duffy / Auto Electricity and Electronics Technology / 1st / Goodheart Willcox / 141


Supplies

Quantity / Item / Source
1 / Wire Connector Set / Parts Store


Equipment

Quantity / Item / Source
1 / Wire Connector Set / Parts Store


Content/Presentation/Demonstration Outline

Safety: Caution: When component testing on/vehicle, the student must be aware that the component can start and run. Spinning fan blades from cooling fan motors, starter motors engaging the flywheel, or window motors causing regulators and windows to move can all pose as potential hazards. Caution: When component testing off/car, make sure component is securely fastened or bolted to a bench or stable platform so that when a motor or component energizes that the student doesn’t become entangled in the moving parts. Students should wear proper eye protection when performing lab operations. Students should use caution when installing, connecting, or disconnecting meter leads as these instruments can be very sharp. Caution must be used when using fused jumpers. The use of a larger fuse than needed could cause a circuit to overheat causing damage to the circuit or even worse, physical injury to the student due to heat or fire related circumstances.
Instruct students that a jumper wire is a piece of wire with a connector of some type at each end. The connector at each end could be a male or female spade, or an alligator clip. Let them know that the jumper should have an inline fuse holder installed so that a fuse of some type must be present at all times. This will allow the student to safely apply power to various circuits without damaging the circuit or jumper. Jumpers can be used to apply power or ground directly to a circuit, bypass a switch, or apply power and ground directly to load.
Switch testing: 1) Instruct the student to apply the fused jumper to both sides of the switch also known as “switch bypassing”. 2) If the switch turned to the on position failed to turn the circuit on but bypassing the switch did turn the circuit on, then the switch is defective.
Circuit Testing for Power: 1) If a circuit fails to operate, a jumper may be used to apply power to the circuit in order to find a break in the circuit or open. 2) If the circuit fails to operate correctly, install one side of the fused jumper directly to battery voltage. 3) Take the other lead of the jumper and apply it to the circuit starting at the fuse and slowly reapply the jumper to other parts of the circuit working towards the load until the circuit starts to operate. 4) If the circuit does not operate, the problem may lie in the ground portion of the circuit.
Circuit Testing for Ground: 1) If a circuit fails to operate, a jumper may be used to apply ground to the circuit in order to find a break in the circuit or open. 2) If the circuit fails to operate correctly, install one side of the fused jumper directly to a ground. 3) Take the other lead of the jumper and apply it to the circuit starting at the circuit ground and slowly reapply the jumper to other parts of the circuit working towards the load until the circuit starts to operate. 4) If the circuit does not operate, the problem may lie in the component or load itself.
Component or Load Testing On/Vehicle: 1) If a circuit still fails to operate, the component or load may be defective. 2) Disconnect the wiring from the load. 3) Apply one side of a fused jumper to battery power and the other side to the components positive terminal. 4) Using a separate fused jumper, apply one side of the jumper to the ground or negative side of the component and the other side of the jumper to ground. 5) This should cause the component to energize, if not, the component is defective and should be replaced.


Applications/Practice

1 / Students can practice this task by applying power and ground to circuits on vehicles or circuits built in a lab setting. Students can component test with a variety of motors and components such as light bulbs and switches.


Evaluation and feedback Prior to Testing or Lab Work

1 / Instructor should evaluate the students’ ability to place the jumper wire in the proper locations. More importantly, the instructor should evaluate the student's ability to interpret the result of jumper wire placement. Verbal questioning of the students' results and findings are helpful to determine his/her level of understanding.


STUDENT ASSESSMENT:(Assess student progress with performance criteria.)

1 / A multiple choice test will be given at the end of this lesson. This will help demonstrate student knowledge of the task. Sample question: Technician A says that when using a jumper wire, a fuse is not required. Technician B says that when checking a component for proper operation, power and ground may have to be supplied at the same time using jumper wires. Answer: Technician B
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students progress in relation to the state objectives? Was the instruction successful? Analyze samples of student work, particularly that which is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial planning and/or during the teaching learning process.)