Many of you may have just enough exposure to electricity to maybe confuse you or to even frighten you. With this in mind, I am hoping the below information may be of some value to you who may have questions about what electricity is. I will make electrical comparisons to that of water to help you have a better understanding since most of you are familiar with water. I will not attempt to be technical. Keep in mind, that this is just an brief overview and for a better understanding of electricity you will need to acquire and read additional resources.
You may find the following helpful in converting the value of these terms into another value...
AMPS = Watts / Volts
VOLTS = Watts / Amps
WATTS = Amps x Volts
Kw = 1,000 Watts
ELECTRICITY is an electromotive force (voltage) and the flow of electrons (current) through a conductor (wire). Think of electric as water flowing through a pipe. The pressure of the water would be represented by voltage and the rate of its flow would be its current (amps). So for example, a flow of 12 pounds per square inch of water at the rate of 4 gallons per minute is similar to 12 volts (pressure) as 4 amperes (current). To increase the flow of water you need to increase the size of the pipe, with electricity you would increase the wire size, which decreasing the wire resistance allowing an increase of current. This flow is called AMPERAGE in electric or you apply more pressure to the water, in electric this pressure is called VOLTAGE.
There are two types of electricity: ALTERNATING CURRENT (AC) which you will find in your home and DIRECT CURRENT (DC) which you would find in say your flashlight or automobile. In AC the flow of electrons first flows in one direction and then they reverse and flow in the other direction. While DC the flow of electrons is in one direction from minus (-) to plus (+).
Here are the major parts which make up electricity...
Don't let this chart scare you, it is really quite simple to work with. It graphically shows us the relationship between VOLTS, AMPERES, OHMS, and WATTS. This chart is a powerful tool because you can refer to it to change value from watts to amperes as you size your PV power systems. You can also use it to determine the size wire is needed to minimize resistance.
Ohms (Ω) is equal to E/I or Ω=V/A
Ohms (Ω) is equal to E/W or Ω=V/W
Ohms (Ω) is equal to W/I or Ω=W/A
Voltage (E) is equal to IR or V=AxΩ
Voltage (E) is equal to W/I or V=W/A
Voltage (E) is equal to √WR or V=√WxΩ
Power (W) is equal to EI or W=VxA
Power (W) is equal to IR or W=AxΩ
Power (W) is equal to E/R or W=V/Ω
Like I said, this is just the basics, for more detailed information you will need to do an Internet search.
Terry R. Wolff