290 Electrical Power Systems Technology
UNIT OBJECTIVES
Upon completion of this unit, you should be able to:
- Define the term “electrical load.”
- List the types and classifications of electrical loads.
- Explain the differences between resistive, inductive, and
capacitive circuits. - Calculate load (demand) factor and power factor.
- Describe power factor correction, using static capacitors or
synchronous capacitors. - Define true power, apparent power, and reactive power in AC
circuits. - Calculate power per phase and total power for balanced or
unbalanced three-phase loads. - Explain the differences between resistive, inductive, and
capacitive electric loads. - Describe electric resistive and arc-welding systems as electrical
loads. - Describe electric heating systems and these associated terms:
BTU
Design Temperature Difference
Degree Days
Thermal Resistance (R)
Coefficient of Heat Transfer (U)
Watts of Heat (W) - Describe heat pumps and air conditioning systems.
- Describe the characteristics of light.
- Define the terms candlepower, lumen, and footcandle as they
relate to light. - Describe types of street lighting systems.
- Explain the characteristics of incandescent, fluorescent, and vapor
lighting. - Describe branch circuits used for controlling electrical lights from
one, two, or three locations. - Calculate the minimum number of branch circuits and total power
requirements for lighting circuits in buildings. - Describe the following factors that affect lighting fixture design:
Luminaire