Read the max amperage of every device, and for safety’s sake assume they’re all taking that all the time. Add them up, and don’t use them all if they exceed the amperage listed on the power strip. You might think you’re just running your TV and PS5, no problem, but a PS5 and a big TV can pull over 6 amps together. So you decide to plug in a vacuum or heater because it’s convenient, and you can easily go over.
If you want to know how much each is actually pulling, they sell devices for that. You can buy a clamp meter that goes around a cable and measures, and you can get plugs that you can plug your device into, and it’ll show the amperage it’s pulling at any one time.
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