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Alternator Books; STEM Smackdown Books in Order

Alternator Books; STEM Smackdown is a 3-book series by Susan E. Hamen for ages 9–12, at a grades 5–6 reading level, with gentle to mild content (HootRated intensity 1–2 out of 5).

Books
3
By publication date
Reading level
Grades 5–6
Average grade level 6
Recommended ages
Ages 9–12
From HootRated age ratings
Content intensity
Gentle to mild
HootRated 1–2 out of 5 · avg 1.3

Alternator Books; STEM Smackdown Reading Order

Series numbers aren't available for most Alternator Books; STEM Smackdown books, so they're listed by publication date (oldest first).

# Title Reading Level Ages Content
1 Who Invented the Light Bulb?
2018
Level 5-6 9-12 Mild
2 Who Invented the Radio?
2018
Level 6-7 9-12 Gentle
3 Who Invented the Telephone?
2018
Level 6-7 9-12 Gentle

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

1
2
3
First book Latest book

Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Alternator Books; STEM Smackdown (3 books by Susan E. Hamen) lands at a grades 5–6 reading level, with average content intensity 1.3/5. Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.

The reading-order table above lists every book with per-volume reading level, age and intensity ratings so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.

Similar reading level, content intensity and themes.

Questions about the Alternator Books; STEM Smackdown series

What reading level is the Alternator Books; STEM Smackdown series?
Alternator Books; STEM Smackdown books are at a grades 5–6 reading level (average grade level 6), and HootRated recommends the series for ages 9–12. There are 3 books in the series.
What order should I read the Alternator Books; STEM Smackdown books?
Series numbers aren't available for most Alternator Books; STEM Smackdown books, so HootRated lists them by publication date: Who Invented the Light Bulb? (2018); Who Invented the Radio? (2018); Who Invented the Telephone? (2018).
What age is the Alternator Books; STEM Smackdown series appropriate for?
HootRated recommends Alternator Books; STEM Smackdown for ages 9–12. Content is gentle to mild (HootRated intensity 1–2 out of 5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.