4. Electric Circuits
Electric Power — Quiz
Test your understanding of electric power with 5 practice questions.
Practice Questions
Question 1
Which expression gives the electric power delivered to a device when the potential difference across it is $V$ and the current through it is $I$?
Question 2
A resistor has resistance $R$ and carries current $I$. Which expression gives the power dissipated in the resistor?
Question 3
A resistor has resistance $R$ and voltage $V$ across it. Which expression gives the power dissipated in the resistor?
Question 4
What is the SI unit of electric power?
Question 5
A device uses $120\ \mathrm{J}$ of electrical energy in $10\ \mathrm{s}$. What is its average power?