A 12 V source drives a 3 Ω resistor. What are the current and power dissipated in the resistor?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the Praxis Physics Exam with interactive questions and detailed explanations to enhance your understanding of physics concepts. Prepare for your exam efficiently!

Multiple Choice

A 12 V source drives a 3 Ω resistor. What are the current and power dissipated in the resistor?

Explanation:
Ohm’s law and how power is dissipated in a resistor are being tested here. The current through a resistor follows I = V/R. With a 12 V source and a 3 Ω resistor, the current is 12/3 = 4 A. The power the resistor dissipates as heat is P = VI, so P = 12 V × 4 A = 48 W. You can also confirm this with P = I^2R or P = V^2/R, both giving 48 W. So the current is 4 A and the resistor dissipates 48 W.

Ohm’s law and how power is dissipated in a resistor are being tested here. The current through a resistor follows I = V/R. With a 12 V source and a 3 Ω resistor, the current is 12/3 = 4 A. The power the resistor dissipates as heat is P = VI, so P = 12 V × 4 A = 48 W. You can also confirm this with P = I^2R or P = V^2/R, both giving 48 W. So the current is 4 A and the resistor dissipates 48 W.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy