Review on 🔌 50ft USB 2.0 High Speed Active Extension/Repeater Cable by Your Cable Store by Chris Long

I used a cable to connect the Gearmo 4 port USB to serial adapter which draws 0.135A. The total current is 0.245A so the cable repeater draws 0.11A. My computer and it sends 4.45V to the Gearmo over 50ft of cable. The first 25 feet will tolerate a 0.245A drop 0.335 VR = 1.37 The second 25 feet will tolerate a 0.135A drop 0.185 VR = 1.37 Total voltage drop 0.52V total R = 2.74 The load gets what's after drop of 2.74 ohms is left. If you have a 0.2A load and a 5.0V supply that works up to: 5.0 - 0.15 - 0.2 * 2.74 = 4.3V USB2.0 shows a minimum of 4.4V, so the 2A load is too much. The maximum current available is 0.164A with an ideal rating of 5.0. At my source 4.97V max 0.153A. YMMVBTW, all measurements were taken with a DROK USB 2.0 DMM, Ammeter, Voltmeter, Capacitance and Wattmeter, a 7 mode multifunction tester which I highly recommend. EDIT: These tests are about power only, so I also added some data tests by connecting the fastest USB drive. on my desk and compare the speed of a direct connection to the speed of a wired connection. My memory card read 25MB/s and write 5MB/s, about half of USB 2.0. I found the write speeds to be identical, but the read speeds dropped 1% when using the cable. A good thing!