Cells and Batteries

Cells and Batteries

A cell is a small source of electrical energy.

A battery is two or more cells joined together. In everyday talking, people also call one cell a battery.

So if someone says, “Put a battery in the remote,” they may mean one small cell.

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Cell vs Battery

Word	Simple meaning	Example
Cell	One small power source	One AA cell
Battery	Two or more cells joined together, or a common word for a portable power source	Phone battery, car battery

Think of it like this:

1 cell = one small energy packet
many cells together = a bigger energy packet

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What Does a Cell Do?

A cell gives a push to the tiny electrons in a circuit.

That push makes electric current flow.

When current flows through a device, the device can work.

Example:

cell -> wires -> small bulb -> wires -> back to cell

If the path is complete, the bulb glows.

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The Plus and Minus Ends

Most cells have two ends:

• positive end, marked with +
• negative end, marked with -

The cell pushes electricity around the circuit from one end, through the device, and back to the other end.

When you put cells inside a toy, the + and - signs must match the picture inside the toy.

If the cell is put the wrong way, the toy may not work.

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Common Cells Children See

Cell type	Where children may see it
AA cell	wall clock, toy, remote
AAA cell	small remote, small toy
Button cell	watch, small light, greeting card
Rechargeable cell	toys, cameras, some lights

Button cells are very dangerous if swallowed. Children should never play with loose button cells.

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Why Do Batteries Run Out?

A cell or battery has stored energy inside it.

When a device uses the energy, the stored energy slowly becomes less.

After some time:

• the torch becomes dim
• the toy moves slowly
• the remote stops working
• the clock stops

Then the cell is used up or needs charging.

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Rechargeable and Non-Rechargeable

Some cells can be charged again. Some cannot.

Type	Meaning	Example
Non-rechargeable	Use it, then replace it safely	many AA cells
Rechargeable	Use it, charge it, use it again	phone battery

Rechargeable batteries should be charged with the correct charger and with adult help.

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Battery Size and Power

A big battery can usually store more energy than a small cell.

But size is not the only thing that matters. The device must use the correct kind.

Examples:

• A TV remote needs small cells.
• A phone has a flat rechargeable battery inside.
• A car needs a large battery to help it start.
• A torch may use one, two, or three cells.

Never force the wrong cell into a device.

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A Gentle Idea: Voltage

Voltage is like the push from a cell or battery.

Imagine water in a pipe:

• more push makes water move more strongly
• more voltage gives electricity a stronger push

For a young learner, remember:

Voltage is the push that helps electricity move.

Only use the voltage the device asks for.

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A Gentle Idea: Current

Current means how much electricity is flowing.

Imagine many tiny scooters moving along a road.

• few scooters = small current
• many scooters = bigger current

For a young learner, remember:

Current is electricity flowing through a circuit.

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What Is Inside a Simple Cell?

A simple cell has chemicals inside. These chemicals can create electrical energy.

You do not need to open a cell to learn this. In fact, never open a cell.

The chemicals belong inside the cell. If they leak out, they can hurt skin or eyes.

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Safe Battery Rules

• Do not put cells or batteries in your mouth.
• Do not open a cell or battery.
• Do not throw batteries into fire.
• Do not touch leaking battery liquid.
• Do not mix old and new cells in a toy.
• Ask an adult to replace or charge batteries.
• Keep button cells away from babies and young children.

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Mini Observation With an Adult

Look at a TV remote or wall clock with an adult.

Find:

1. the + sign
2. the - sign
3. the number of cells
4. the size written on the cell, like AA or AAA
5. what the device does when the cells are put in correctly

Do not touch leaking, rusty, or broken cells.

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Quick Practice

1. What is one small source of electrical energy called?
2. What signs are found on many cells?
3. Why must a cell be put in the correct direction?
4. What happens when a battery runs out?
5. Can all batteries be recharged?
6. Name one battery safety rule.