Particularly with low voltages, triacs are usually used as control elements for ac voltages. The disadvantage, as so often is the case, is in the power dissipated in the control element, which is quite evident for currents greater than 1 ampère. In such cases, it is essential to use a heatsink for the triac. If you want to control the brightness of a halogen lamp using such an arrangement, for example, the voltage drop across the triac also results in a significant reduction in the maximum brightness of the lamp.
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