Let's solve this
Energy Transfers worksheet step by step. The goal is to identify the
type of energy input and
output for each device, based on how energy is transferred.
We are given a list of energy types:
- Chemical potential
- Kinetic
- Elastic potential
- Electrical
- Gravitational potential
- Light
- Thermal
- Sound
---
1. Battery-powered torch
-
Energy in: *Chemical potential* (from the battery – chemical reactions release energy)
-
Device: Battery-powered torch
-
Energy out: *Light* (the main purpose is to produce light), and also some *Thermal* (heat from the bulb), but the primary useful output is
light.
✔ So:
-
Energy out:
Light
> Note: Some thermal energy is also produced, but the question likely wants the main useful output.
---
2. Kettle
-
Device: Kettle
-
Energy out: *Thermal* (it heats water)
- So what is the
energy in?
A kettle is typically plugged into an electrical outlet → it uses
electrical energy to heat up.
✔ So:
-
Energy in:
Electrical
---
3. Microphone
-
Device: Microphone
- A microphone converts
sound waves (which are vibrations) into
electrical signals.
- So:
-
Energy in: *Sound* (sound waves enter the microphone)
-
Energy out: *Electrical* (output as electrical signal)
✔ So:
-
Energy in:
Sound
-
Energy out:
Electrical
---
4. Pendulum
-
Device: Pendulum
- A pendulum swings back and forth.
- At the highest point: it has
gravitational potential energy.
- As it swings down, this converts to
kinetic energy.
- Then back again.
So energy is being transferred between:
-
Gravitational potential energy (at top)
-
Kinetic energy (at bottom)
But we need to fill in one
energy in and one
energy out.
In a pendulum, the
initial energy comes from lifting it (giving it gravitational potential energy). Then, as it swings, that turns into kinetic energy.
So:
-
Energy in: *Gravitational potential* (when lifted)
-
Energy out: *Kinetic* (as it moves)
✔ So:
-
Energy in:
Gravitational potential
-
Energy out:
Kinetic
> Note: In reality, some energy is lost to thermal and sound due to air resistance, but the main transfer is between gravitational potential and kinetic.
---
✔ Final Answers:
#### 1. Battery-powered torch
- Energy in:
Chemical potential
- Device: Battery-powered torch
- Energy out:
Light
#### 2. Kettle
- Energy in:
Electrical
- Device: Kettle
- Energy out:
Thermal
#### 3. Microphone
- Energy in:
Sound
- Device: Microphone
- Energy out:
Electrical
#### 4. Pendulum
- Energy in:
Gravitational potential
- Device: Pendulum
- Energy out:
Kinetic
---
Summary Table:
| Device | Energy in | Energy out |
|---------------------|-------------------------|-------------------|
| Battery-powered torch | Chemical potential | Light |
| Kettle | Electrical | Thermal |
| Microphone | Sound | Electrical |
| Pendulum | Gravitational potential| Kinetic |
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Parent Tip: Review the logic above to help your child master the concept of energy transformation worksheet 6th grade.
