Practice Units Of Power (4.3.2) - Work, Power, and Energy

Practise this section

10 questions

Flashcard drill
5 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is the unit of power?
Show hintHide hint
It's named after a famous inventor.
Question 2.
How do you calculate power using voltage and current?
Show hintHide hint
Think about the rate of work being done.
3Question 3.
What is the formula for calculating power in an electrical circuit?
- P = V + I
- P = V ⋅ I
- P = V / I
Show hintHide hint
Remember, it's about how fast energy is used.
4Question 4.
True or False: One Watt is the equivalent of one Joule per minute.
- True
- False
Show hintHide hint
Think about time - seconds matter here.
Question 5.
You have a device that operates at 240 V and draws 10 A. Calculate the power it uses and explain how you derived your answer.
Show hintHide hint
Remember the basic power formula.
Question 6.
A power line rated at 100 kV transmits 2000 A. Calculate the power loss if the resistance of the line is 0.5 Ω per km and it transmits power over 10 km.
Show hintHide hint
Consider how resistance affects power loss.

6 more questions in this section. Enroll free to practise them all.