If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

To log in and use all the features of Khan Academy, please enable JavaScript in your browser.

Main content

Course: High school physics - NGSS > Unit 3

Lesson 1: Introduction to energy

© 2024 Khan AcademyTerms of use Privacy Policy Cookie Notice

Understand: introduction to energy

Google Classroom

A woman plugs a hair dryer into an electrical wall outlet and directs the jet of hot air towards her hair.

Which of the following best describes how energy flows through this system?

(Choice A)
Electrical energy is transferred to the hair dryer and converted into air.
(Choice B)
Thermal energy is transferred to the hair dryer and converted into electrical energy.
(Choice C)
Electrical energy is transferred to the hair dryer and converted into thermal and kinetic energy.
(Choice D)
The hair dryer transfers electrical energy to the wall outlet.

Related content

Video 3 minutes 39 seconds

What is energy?

Video 13 minutes 7 seconds

Law of energy conservation