Solar Photovoltaic Basics, A Study Guide for the NABCEP Entry Level Exam by Sean White4324

www.TechnicalBooksPdf.com
Electricity basics
When we talk about the amount of solar in the United States, we will say that
the US has over 13GW of PV operating as of 2013. That number usually doubles
about every 18 months.
Be sure to fully understand the following definitions and relationships.
Go back a few times a day if you have to. Bookmark this page or fold
the corner.
Simple definitions:
•
Relationships:
•
Units:
•
Symbols
•
Voltage: Electrical pressure
Current: Electrical flow
Power: Rate at which electricity is used
Energy: Amount of electricity used
Power = Voltage × Current
Energy = Power × Time
Voltage is measured in Volts = V
Current is measured in Amps = A
Power is measured in Watts = W
Energy is measured in Wh or more often kWh
Current = I (I for Intensity)
Voltage = V or E
• Power = P
How to do the math required to be entry level PV proficient:
W = V × I
To solve for V, we put I under W
V = W/I
23