After the oven is preheated, just open the door and put the food in directly.

The need to preheat the oven is due to the way the oven is heated. Oven heating is fluctuating heating, heating tube only energized heating and stop working two states, as long as the work will work at full power, when it reaches the specified temperature, it will stop working; when the temperature is low will work again, and so on and so forth. So the oven heating only 0 and 1 two, this heating mode are all are fluctuating, so the temperature will not be maintained at a specific temperature, will only be maintained in a certain temperature range.

The significance of preheating:

The oven's heating tubes work when the oven is started from cold until the desired temperature is reached. It is important to know that the temperature of the heating tube direct heating is very high, if the food is exposed to the direct heating of the heating tube for a long time, the food will be easily scorched, it will appear that the surface is scorched, but the internal is not yet cooked.

So when you put the food in, you need to preheat the oven first, so that the internal temperature of the oven is close to the desired cooking temperature, and to reduce the time of direct heating of the food by the heating pipe, in order to minimize the chance of the surface of the food being scorched.

Expanded Information:

Take care of the cleaning of the electric oven the first time you use it. First wipe the oven inside and out with a clean damp cloth to remove some dust. Then you can empty the oven using high temperature baking for a while, sometimes there may be white smoke, which is normal. After baking, pay attention to ventilation and cooling.

After cleaning, you can use the electric oven normally. Before baking any food, it is necessary to preheat the oven to the specified temperature in order to meet the baking time specified in the recipe. It takes about 10 minutes to preheat the oven, but if you leave the oven empty for too long, it may affect the life of the oven.