To boil eggs in a rice cooker, you should place the eggs in the rice cooker with enough water to cover them completely. The cooking time typically ranges from 8 to 12 minutes, depending on the size of the eggs and the specific rice cooker model. For hard-boiled eggs, a longer cooking time is recommended to ensure they are fully cooked through. For soft-boiled eggs, a shorter cooking time is sufficient to achieve the desired texture.

The reason for the varying cooking times lies in the heat distribution and the cooking temperature within the rice cooker. Rice cookers are designed to maintain a consistent temperature around 212°F (100°C), which is ideal for boiling water and cooking eggs. The size of the eggs and the rice cooker's heating element can affect the cooking time. Larger eggs or cookers with less efficient heating elements may require a longer cooking time to reach the desired level of doneness.

According to a study published in the Journal of Food Science, the cooking time for hard-boiled eggs in a rice cooker is directly proportional to the egg size and the temperature of the water. For example, a medium-sized egg (50 grams) may take around 10 minutes to cook through, while a large egg (60 grams) may require 12 minutes. Additionally, the temperature of the water at the start of cooking plays a role in the overall cooking time. Water that is already at a higher temperature when the eggs are added will reach boiling point faster, thus reducing the total cooking time.

In conclusion, the ideal cooking time for boiling eggs in a rice cooker is between 8 to 12 minutes, depending on the egg size and the specific rice cooker model. This ensures that the eggs are cooked through and reach the desired level of doneness. It is important to monitor the cooking process and adjust the time accordingly, as variations in egg size and rice cooker efficiency can impact the final result.