Download BMLR2 Unit 5

BMLR 2 Foundations to Automotive
Unit – 5
Time Allowed - CLASS – 2 HOURS / LAB – 8 HOURS
TDL-BMLR-3
Identify and utilize proper tools and equipment.
NAME
DATE
NATEF TASK #
PERIOD
8a4
OBJECTIVE After completing this unit, the student should be able to measure engine
components and test cylinder compression on trainers. The student will demonstrate mastery of
the material by completing theory assignments, videos and a written test with a passing grade of
(70%).
Order of Assignments:
START
T-1, T-2, T-3, C-1, A-1, L-1, C-1, L-2, C-1, C-2
THEORY ASSIGNMENT(S)
Reference Materials:
1. Text – Modern Automotive Technology
AUDIO VISUAL(S)
Pg. 254 until 257
T-1
Read Chapter 18
T-2
Complete Chapter 18
T-3
Complete Chapter 18 Review & ASE
Answers Only
LAB ASSIGNMENT(S)
CHECK POINT(S)
L-1
C-1
Instructor
Check
C-2
Chapter 14
Test
Circuit Testing
Chapter 18 Notes (Pg.254 to 257)
1. A
is a closed electrical path for current.
2. A
circuit has only one path for current.
3. A
has more than one path for current.
4. A
circuit, also called combination circuit, is a combination of
series circuit and a parallel circuit.
Draw out a series circuit and a parallel circuit as described in figure 18-1 & 18-7.
5. A
circuit, also called a one-wire circuit, uses the metal
structure of the vehicle to return electricity to the power source.
6. The wire that carries current to the load is the
wire.
7.
is a set of formulas that express the relationships between voltage,
current, and resistance in an electric circuit.
The abbreviation for voltage or (Volts) is
The abbreviation for current or (Amps) is
The abbreviation for resistance or (Ohms Ω) is
8. E= x R ( Voltage equals current multiplied by resistance.) Volts= amps x ohms
9. I=E
R ( Current equals voltage divided by resistance.) Amps= volts ÷ ohms
10. R= ÷I ( Resistance equals voltage divided by current.) Ohms= volts ÷ amps
11. Draw the 3 triangles at bottom of page 257 in figure 18-10 and fill in the 3 spaces in the
triangles. Write formulas under triangles also.
12.A change in
alters the amount of current in a circuit.
13. Work out these formulas using Ohm’s Law. On page 257
(12 volts, 3 ohms) What is the current or amperage?
(12 volts, 5 ohms) What is the current or amperage?
(7 Ohms, 11 amps) What is the voltage or volts?
(12 volts, 12 amps) What is the resistance or Ohms?
14. Most automotive electrical problems are caused by a change in circuit
.