AIT 125 - DC and AC Components

3 Credits, 5 Contact Hours
2 lecture periods 3 lab periods
An introductory course in AC and DC electric theory. Includes electric circuits using resistors, capacitors, and inductors. Also includes solenoids, relays, transformers, basic DC and AC motors, circuit protection devices, and a variety of switches.

    

1. Analyze electrical circuit diagrams by identifying circuit components, voltages, currents and power. 
2. Describe the operation of control and sensing components such as limit switches, pressure switches, float switches and proximity sensors when used as interrupters in a circuit. 
3. Demonstrate the use of a multimeter to measure voltage, current and resistance in a circuit and to troubleshoot basic electrical problems. 
4. Select circuit protection devices such as fuses, ground fault circuit interrupters (GFCI) and circuit breakers. 
5. Test circuit protection devices such as fuses, GFCI and circuit breakers. 
6. Identify the basic use of a multimeter to find basic electrical faults in components such as resistors, capacitors, inductors/solenoids, relays, transformers and electric motors.

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1. Reading and interpreting electrical circuit diagrams
   1. Fundamental electrical theory 
      1. Electric charge
      2. Resistance
      3. Electric current 
      4. Voltage
      5. Magnetism
   2. Schematic symbols
   3. Operation of components   
   4. Electrical components identification
   5. Ohm’s Law 
   6. Kirchoff’s Circuit Laws
      1. Kirchoff’s Voltage Law (KVL)
      2. Kirchoff’s Current Law (KCL)  
   7. Analysis of circuits
      1. Series circuits
         1. Resistors
         2. Capacitors
         3. Mathematical formulations and calculations
         4. Current flow
         5. Voltage drops
         6. Combinations of components in circuits
      2. Parallel circuits
         1. Resistors
         2. Capacitors
         3. Mathematical formulations and calculations
         4. Current flow
         5. Voltage drops
         6. Combinations of components in circuits
      3. Circuits with inductors
         1. Measuring inductive reactance
         2. Mathematical formulations and calculations
         3. Current flow
         4. Voltage change
         5. Combinations of components in circuits
      4. Circuits with transformers
         1. Measuring resistance
         2. Sizing
         3. Mathematical formulations and calculations
         4. Current load
         5. Voltage change
         6. Turns ratio      
2.  Sensor and switch function and application 
   1. Capacitive sensor
   2. Inductive sensor
   3. Photoelectric sensor
   4. Magnetic reed switch
   5.  Limit switch
   6. Float switch
   7. Pressure switch
3. Multimeter use for electrical measurement
   1. Voltage
   2. Current
   3. Resistance
   4. Continuity check
   5.  Clamp meters
4. Circuit protection components
   1. Fuse and circuit breaker selection in accordance with National Electrical Code (NEC)
      1. Determining wire size
      2. Determining wire ampacity
   2. Fuse types and uses
   3. Fuse testing procedures
   4. Circuit breaker testing procedures
   5. Operation of Ground-Fault Circuit Interrupters (GFCIs)
5. Multimeters and electrical troubleshooting
   1. Testing resistors
      1.  Rated value
      2. Opens
      3. Shorts
   2. Testing capacitors
      1. Rated value
      2. Opens
      3. Shorts
   3. Testing inductors
      1. Rated value
      2.  Opens
      3. Shorts
   4. Testing relays
      1. Coils
      2. Contacts
      3.  Function
   5. Testing solenoids
      1. Coils
      2. Function
   6. Testing transformer windings
      1. Opens
      2. Shorts
      3. Primary to secondary isolation
      4. Resistance
   7. Testing electric motor windings
      1. Opens
      2. Shorts
      3. Winding insulation resistance
6. Electric Motors
   1. DC electric motors
   2. Single phase AC motors
7. VII. Electric wiring 
   1. Wiring color code
   2. Wire gauge