You can easily find the power rating of your appliance at the attached label on the product. All products usually come with it. You can also google the product model to find it if you couldn’t find it attached.
I will provide you an approximate power rating of common household appliances below courtesy of https://www.altestore.com/howto/power-ratings-typical-for-common-appliances-a21/
 

Lcd tv
100-250
W

Plasma tv
345
W

Radio
10
W

Satellite dish
30
W

Stereo
60
W

Stereo portable
20
W

Tv box
23
W

Game console generic
50
W

Dvd player
15
W

Wii
45
W

Play station 2
50
W

Tv lcd 45 inch
133
W

Tv led 45 inch
88
W

Tv plasma 45 inch
288
W

Tv lcd 32 inch
55
W

Tv led 32 inch
61
W

Tv plasma 32 inch
119
W

Tv lcd 19 inch
50
W

Tv led 19 inch
50
W

Tv plasma 19 inch
100
W

Cd player
10
W

Amplifier
20-70
W

Television, rear projection
200
W

Tv standby
6
W