The electric motor and magnetic-field problems

Lessons 59–60 · 2 lessons · P.Q. Habibullayev, A. Boydedayev, A.D. Bahromov, J.E. Usarov, K.T. Suyarov, M.K. Yuldasheva. Physics, textbook for Grade 8 of general secondary schools, revised and enlarged 3rd edition. “O‘qituvchi” Publishing and Printing Creative House, Tashkent, 2019

Answers are for parents and teachers.

U = 12 V, I = 2 A. The motor power in W?

P_total = 800 W, P_useful = 600 W. Efficiency in %?

B = 1.5 T, I = 4 A, l = 0.5 m. The Ampère force in N?

List the motor’s parts and their roles.

Name three devices that use electric motors.