All questions
AP Physics 2
11.6 Kirchhoff’s Loop Rule
11.4 Electric Power
IntermediateMCQMathematicalConceptual18.7k
A single-loop circuit schematic. On the left vertical wire is a DC voltage source labeled V = 24 V with its long positive terminal on top. On the top horizontal wire is a resistor representing internal armature resistance labeled R = 2.0 \Omega. On the right vertical wire is a circle containing the capital letter M representing the motor, with an opposing voltage symbol labeled \mathcal{E}_b = 20 V pointing opposite the source voltage. Smooth conducting wires complete the rectangular loop. No other labels, lines, text, or axes appear.
Circuit model of the DC motor connected to a DC source.
A DC motor with an internal armature resistance of \(2.0 \ \Omega\) is connected across a constant \(24 \text{ V}\) power source. When the motor is prevented from turning (stalled), it draws a large current because no back-emf is generated. When operating at its normal running speed, the rotating motor generates a back-emf of \(20 \text{ V}\). What are the electric current through the motor and the mechanical power output produced by the motor at normal operating speed?

Log In to Continue

Accounts are free! Log in to try this question, see explanations, save progress, and more!

Similar Questions

Tools for a 5

The Quiz Lab library of AP Physics quizzes AP aligned mock tests to help you get a 5. With grading, adaptive explanations, and more. Find a Quiz Find, solve, and grade every AP FRQ ever. Find an FRQ Stuck on AP Physics 2? Get unstuck with an AP specialist.1 to 1 tutors who know the exam inside out. Understand weeks of material in a single session.Find a Tutor Learn AP Physics from scratch, quickly. This is the only course you'll need for the year. A self-paced course with everything you need to get a 5. Trusted by over 15,000 students and 200+ schools. Learn fast, or we'll refund your purchase, backed by our 100% satisfaction guarantee. Explore the Course