Method for judging heat preservation of small electric cooker
You can use a multimeter to measure its resistance, which should be around 300 ohms. Different brands, models and power sizes. The resistance values are not the same, but they are generally in the range of several hundred ohms. If you don't have a multimeter at hand, you can choose a more risky approach, and directly lead two wires to 220v on the heating plate to see if it has a temperature.
Of course, you must try to touch it before doing so to ensure safety. As long as you act quickly when trying to touch, you can completely avoid short-circuit accidents.
It can be measured by a universal meter, which can only be divided into pointer and digital. Measure the quality of the heating plate of the rice cooker. When the multimeter hits the electric block: 1K or 10K, it is good.