Compound Direct Current (DC) Circuits AP Physics 2 MCQ – Exam Style Questions etc.
Compound Direct Current (DC) Circuits AP Physics 2 MCQ
Unit 11: Electric Circuits
Weightage : 15–18%
Exam Style Practice Questions , Compound Direct Current (DC) Circuits AP Physics 2 MCQ
Question
Which of the following combinations of 4Ω resistors would dissipate 24 W when connected to a 12 Volt battery?
Answer/Explanation
Ans.E
Solution
To dissipate 24 W means R = V2/P = 6 Ω. The resistances, in order, are: 8 Ω, 4/3 Ω, 8/3 Ω, 12 Ω
and 6 Ω
Question
A hair dryer is rated as 1200 W, 120 V. Its effective internal resistance is
(A) 0.1 Ω (B) 10 Ω (C) 12Ω (D) 120 Ω (E) 1440 Ω
Answer/Explanation
Ans.C
Solution
P = V2/R