Comment by raron

Resistors doesn't "limit the current flow", they just (let's say) make it harder to "push" the same amount of current through. (If you increase the voltage you will get higher current flowing through any resistor.)

There are ways to limit the current through some components regardless of the applied voltage (to a sane level) without producing much heat. These are active switching mode DC-DC converters widely used eg. for driving LEDs in (higher quality) light bulbs and charging batteries.