I posted a question earlier that helped me to understand Ohm's Law and how power is lost to length of wire due to resistance. So my original example was a 15A, 10ft cable surge protector plugged into a 15A 6 foot cable plugged into a extension cord 13A 10ft which then has the appliance's cable at 8 ft. The max power this device would need is 110 watts.
We worked out Ohms law:
๐=0.922๐ดร0.434ฮฉ=0.367๐
I do not understand how the 0.367 W applies to the power needed (110 watts)? Does this mean if the TV needs to pull at max and requests 110 watts it will only receive 109.64? This is safe and will it not damage any of the TVs components, I heard under powering is very bad.
Best Answer
Most appliances have regulated power supplies, meaning that they adjust the resistance they present to the power cable to ensure that they always get the same power.
However for devices without regulation, the device really will get less power. For example, people often expect to be able to string large numbers of 5v LED strips together, only to find that the further diodes get dimmer and eventually stop lighting up all together. This is due to the resistance of the wiring limiting how much power the more distant lights get.