It will generate some heat. 10 Ohms will generate close to 4W (of dissipation) when you're key-down. Less average power than that on low duty cycle modes like SSB.
I usually use about a 25W resistor with an air core that let air flow through it, keeps it cool. These things come with "clips" that push into the ends of the resistor and provide a mounting hole for them so they can be screwed down to insulated (ceramic) standoffs.
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