Method
Like a heating pad, electric blankets use an insulated wire or heating element inserted into a fabric that heats when it is plugged in. The temperature control unit, located between the blanket and the electrical outlet, manages the amount of current entering into the heat elements in the blanket. Newer electric blankets work on a low voltage of 24 volts and have a shutoff mechanism to prevent the blanket from overheating or catching fire. Older units (prior to about 2001) may not have a shut-off mechanism and users run the risk of overheating. Older blankets are considered fire hazards.
Read more about this topic: Electric Blanket
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