Little Learnersplay. practice. discover.
Explore

Grade 4 · Science

Describe energy transfers in everyday devices

Identify useful energy outputs while recognizing that devices can transfer energy in several ways.

6 authored questions + worked example

Play this skill Make a practice check

Worked example

A battery-powered lamp is used to illuminate a page. Which useful output serves that purpose?

Answer & why

Answer: light

Light from the lamp makes the page visible.

Add to plan

All questions

All 6 authored questions for this skill.

Question 1

A toaster is used to warm bread. Which useful output serves that purpose?

  1. heating
  2. motion
  3. light
  4. sound
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: heating

Energy transfers thermally to warm the bread.

Add to plan

Question 2

An electric bell is used to announce the end of a lesson. Which useful output signals the class?

  1. light
  2. motion
  3. heating
  4. sound
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: sound

The audible bell sound communicates the signal.

Add to plan

Question 3

A small electric motor turns a model wheel. Which useful output turns the wheel?

  1. heating
  2. light
  3. sound
  4. motion
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: motion

The motor produces mechanical motion.

Add to plan

Question 4

An electric heater is used to warm a room. Which useful output is intended?

  1. light
  2. sound
  3. motion
  4. heating
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: heating

Energy is transferred into the room as heat.

Add to plan

Question 5

A battery-powered lamp is used to illuminate a page. Which useful output serves that purpose?

  1. motion
  2. light
  3. sound
  4. heating
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: light

Light from the lamp makes the page visible.

Add to plan

Question 6

An electric fan is used to move air. Which useful output turns its blades?

  1. sound
  2. light
  3. heating
  4. motion
A hint

Name the device’s energy input, such as electrical energy.

Answer & why

Answer: motion

Electrical energy is transferred into the motion of the fan.

Add to plan