The energy required to boil water can vary depending on the specific microwave oven, stove top (electric burner), and induction cooktop, as well as the initial temperature and quantity of water being heated. However, I can provide you with approximate values based on common scenarios.
Microwave Oven: Microwave ovens are generally efficient at heating water due to their direct penetration of microwaves into the liquid, which heats the water molecules. On average, it takes about 1100 to 1500 watts of power to boil a cup (240 mL) of water in a microwave. If you have a 1000-watt microwave, it might take around 2 to 2.5 minutes to bring a cup of water to a rolling boil.
Stove Top (Electric Burner): Electric stovetops typically have coil burners with varying power levels. Each coil burner can have different wattage ratings. On average, an electric stove burner can range from 1000 to 2500 watts. So, it would take roughly 2 to 5 minutes to boil a cup of water on an electric stove with a single burner.
Induction Cooktop: Induction cooktops are generally more efficient than electric or gas stoves because they directly heat the pot or pan using electromagnetic induction. They can convert almost 80-90% of the energy into the cooking vessel, making them faster and more energy-efficient. Induction cooktops can have power ratings ranging from 1000 to 3500 watts for a single burner. Boiling a cup of water on an induction cooktop could take around 1.5 to 3 minutes.
Keep in mind that these are just rough estimates, and the actual time and energy consumption may vary depending on the specific appliances and their power ratings. It's also worth noting that the efficiency and performance of appliances can improve over time with advancements in technology and energy-saving features.