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Lemon Battery: Where Does the Voltage Come From? | Kids’ Science Song

◷ 2:00

Does a lemon contain ready-made electricity? This upbeat song shows how lemon juice acts as an electrolyte while separate zinc and copper electrodes take part in a chemical reaction. Connect the leads and a multimeter reveals the small voltage as a number. Try it only with adult help.

Concepts explained

Concept glossary ↗

Original explanations based on the cited sources.

Electricity

Electric current is a directed flow of electric charge. Electrons carry it in metal wires, while ions can carry it in solutions.

Sources

Batteries and cells

An electrochemical cell turns energy from chemical reactions into electrical energy. A battery can contain one or more cells and power a closed circuit.

Sources

Text from the recording’s subtitles.

Song lyrics
Será que o limão guarda corrente? Não! Com suco, zinco e cobre há reação! Um adulto rola o limão na bancada Depois põe os dois metais no mesmo suco Ficam perto, mas não podem se tocar O suco funciona como eletrólito Íons se movem, ajudando a reação Não há corrente pronta dentro do limão Suco, zinco e cobre formam uma pilha A reação química gera baixa tensão O multímetro mostra isso em um número Um adulto prende as garras nos metais Os fios ligam tudo ao multímetro A gente espera; a tela vai mudando E um número pequeno aparece Não há corrente pronta dentro do limão Suco, zinco e cobre formam uma pilha A reação química gera baixa tensão O multímetro mostra isso em um número Os dois metais são iguais? Não, zinco e cobre são diferentes Os eletrodos podem se tocar? Não, no suco ficam separados O que mostra o multímetro? Um número indica uma tensão pequena Não há corrente pronta dentro do limão Suco, zinco e cobre formam uma pilha A reação química gera baixa tensão O multímetro mostra isso em um número Não é magia: é uma pequena pilha!
Language version lyrics
Is ready current hiding in this lemon? No! Juice, zinc, and copper start a reaction! An adult gently rolls it on the counter Then puts zinc and copper in the same juice Close together, but they must never touch! The juice is an electrolyte; ions move in it That helps the chemical reaction take place No ready current hides inside the lemon Juice, zinc, and copper make a simple cell The reaction produces a small voltage The multimeter shows it as a number An adult clips two leads onto the metals The wires connect them to the multimeter We hold our breath; the display starts to change Then a little number comes into view No ready current hides inside the lemon Juice, zinc, and copper make a simple cell The reaction produces a small voltage The multimeter shows it as a number Are the two metals the same? No, zinc and copper are different! Can the two electrodes touch? No, keep them separate in the juice! What will the multimeter show? A small voltage, shown as a number! No ready current hides inside the lemon Juice, zinc, and copper make a simple cell The reaction produces a small voltage The multimeter shows it as a number Not magic—just a little lemon cell!
Open on YouTube ↗
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The Lemon Secret | Invisible Ink Science Song for Kids

Follow a lemon-juice treasure map as its dried lines become almost invisible, then turn brown with careful warming. This catchy science song explains that the juice marks remain on the paper and change with heat. Only an adult handles the iron while the child watches from a safe distance.

Chemistry↗
3:13
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How Does a TV Make a Fish Move? A Kids’ Song

Maja turns on the TV and wonders how a fish can swim across the screen—and where its splash comes from. This song explores how a signal guides pixels and speakers, how changing still pictures appear to move, and how a vibrating speaker moves the air to make sound.

Technology↗