Switching. It switches tiny transistors which become short circuits with a little resitance. Current^2 x resistance equals heat that needs dissipation. The switching is so fast it may as well be continuous. Overclockers increase switch frequency and voltage? So more voltage more current, fast switching more current through resistance to generate heat. You can turn your light bulb on, then touch it after 10 minutes, turn it on for minute then off for 1 mi ute. But if you switch it on and off 100000 times a second its pretty equivalent to continuous current and power drop
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