Real-Life Math -- Solution
The first camera can do the job alone.
1-camera scenario:
The camera should be placed 24 feet from the source to cover the zone (placed in the middle of the zone [zone is 24 feet long, 12 feet from the source at the beginning, 36 feet from it at the end]).
Voltage drop is 6 volts after 24 feet from the source (1.5 volts x 4 sets of 6 feet).
The camera sits pretty at 24 feet, powered by the minimum 6 volts and operating with a clear picture.
2-camera scenario:
The cameras are placed at 18 feet and 30 feet to cover the zone (placed on either side of the zone's middle [zone is 24 feet long, 12 feet from the source at the beginning, 36 feet from it at the end]).
Voltage drop is at one-third the rate of a 1-camera scenario (2 volts lost rather than 1.5 volts per 6 feet).
-At 18 feet, voltage drop for camera 1 is 6 volts (2 volts x 3 sets of 6 feet) and operating with a clear picture at the minimum 6 volts
-However, at 36 feet, voltage drop for camera 2 is 12 volts (2 volts x 6 sets of 6 feet) and therefore not operating at all
"When you turn on a garden hose, you only have water pressure coming in at one end. And the pressure drops with the distance it travels along the length of the hose," says Becker. "It's the same principle with electricity."