Electric Charge

The Invisible Force Behind Lightning

What invisible force causes lightning and static cling? The answer is electric charge.

Electric charge is the basic property of matter responsible for electrical effects.

Lightning over ESO Headquarters · ESO/P. Horálek · CC BY 4.0 · Wikimedia Commons

You cannot see charge directly. You see what it does: static cling, a tiny spark, or a huge bolt of lightning.

Every electrical event you will study starts with this one idea.

Two Kinds of Charge

Electric charge comes in two forms: positive and negative.

An object can carry positive charge or negative charge. Either way, we call it a charged object.

The sign matters. It decides how two charged objects behave toward each other.

Think of the two signs as opposite partners. That idea sets up the rule on the next page.

Opposites Attract, Likes Repel

Here is the core rule: opposite charges attract, while like charges repel.

Positive and negative pull toward each other.

Two positives push apart. Two negatives also push apart.

A common slip is thinking only one sign repels. Any matching pair repels, whatever the sign.

Force Without Touching

Charged objects can exert forces without touching.

Picture a balloon sticking to a wall. No glue or tape holds it there. The attraction between charges does the work.

Notice there is no tape or glue: the pull between charges alone keeps the balloon in place.

This is why charge feels invisible. The push or pull reaches across a gap.

Later, you will describe this reach using electric fields.

Small Spark, Giant Bolt

The same idea explains events of very different sizes.

Walk across a carpet, touch something, and you may feel a small spark.

Lightning is a large electrical discharge in the sky. Both come from electric charge.

The scale changes. The basic cause stays the same.

The Foundation for What Comes Next

Electric charge is the fundamental source of all electrical phenomena.

Understanding it prepares you for electric fields, voltage, current, circuits, and electronic devices.

Key takeaways: charge is positive or negative. Opposites attract and likes repel. Charged objects act without touching.

Next time you see a spark or a clinging balloon, ask: which charges are interacting?

Electric charge is a basic property of matter responsible for electrical effects.

• True
• False

Answer: True

This statement is true. Electric charge is a property of matter that produces electrical effects such as sparks, static cling, and lightning.

Opposite charges _____, while like charges _____.

Answer: Opposite charges attract, while like charges repel.

Positive and negative charges pull toward each other. Two positive charges or two negative charges push apart.

A balloon sticks to a wall without glue or tape. Which explanation best fits this behavior?

• Charges exert an attractive force without touching
• The balloon is held by invisible glue
• Only positive charges can make objects stick
• The wall pushes the balloon away

Answer: Charges exert an attractive force without touching

Charged objects can attract across a gap, so the balloon can stick to the wall without touching it beforehand or using adhesive.