Running a long cable to an outside analog security camera.

Running a 20 metre cable (video and power) to an outside analogue security camera. The camera is powered via the cable by a 12 Volt 2 amp power pack.
BNC connectors are used at both ends of the video coaxial cable which is noticeably thicker than the power cable.
There is no audio connection because the twin cable only provides for power and a video signal.
There will be a slight voltage drop along the 20 metres (65.6 feet) power cable, but not enough to affect the quality of the video signal generated by the camera.