# Two spirals of an electric stove with a resistance of 10 ohms each are connected in series and connected

December 29, 2020 | education

| **Two spirals of an electric stove with a resistance of 10 ohms each are connected in series and connected to a network with a voltage of 220 V. Water weighing 1 kg boiled on this stove after 174 s. What is the efficiency of the process if the initial water temperature is 20 ° C?**

Efficiency = Ap / Az * 100%

Ap = s * m * T = 80c = Q

Az = U ^ 2 * t / Ro = 220 * 220 * 174/20

Efficiency = (80 * 4200 * 20 / (220 * 220 * 174)) * 100% = 79%

Answer: The efficiency is approximately 79%

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.