The best extension cord for a TV is a standard 2 prong extension cord which can handle the amperage of a TV just fine.
Larger extension cords can be used and even a power strip but any standard 2 prong extension cord will work just fine with the TV.
The amount of amps that a TV uses is between 0.25 amps to 1.7 amps.
The actual amount of amps that the TV uses will depend on the size and wattage of the TV.
Older CRT TVS used more amps than the newer LED TVS do now.
Small LED TVs use between 0.25 amps to 0.5 amps.
Medium LED TVs use between 0.42 amps to 1 amps.
Large LED TVs use between 0.83 amps to 2.08 amps.
TVs use between 50 watts to 200 watts of electricity which is between 0.5 amps to 3 amps.
Newer LED TVs are more energy efficient than the older CRT TVs and they also use less electricity.
The newer LED TVs electricity usage is hardly noticeable on your electric bill.
For the newer LED TVs you can use a regular household 2 prong extension cord which will handle the TV electricity consumption without any issues or even a standard power strip can also handle the power from a LED TV.