☰ Contents · Physics

Power problems and lamp power

Lessons 32–33 · 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.
1
U = 9 V, I = 0.2 A. The power in W?
2
A heater has R = 20 Ω and I = 3 A. Its power in W?
3
A 60 W lamp burned for 10 hours. How many W·h were used?
4
Why can the measured power differ from the marked power in a lab?
5
Write two safety rules for working with a lamp circuit.