Electricity is the flow of tiny charged particles called electrons. Electrical charges interact through electric force, which can attract (pull together) or repel (push apart) objects—even without direct contact!

1. Static Electricity: Charges at Rest

Static electricity is the natural buildup of electrical charges on the surface of an object, usually caused by friction (rubbing two objects together).

• How It Works: Rubbing objects transfers electrons from one object to another, creating an imbalance of positive and negative charges.

• Attract vs. Repel:

  • Unlike charges attract: Rubbing a balloon on hair gives them opposite charges, causing the hair to stick to the balloon.

  • Like charges repel: Rubbing two balloons on a carpet gives them the same charge, causing them to push away from each other.

• Static Discharge: When the charge buildup becomes too great, it can jump to another object as a spark or shock. Lightning is a massive natural static discharge!

2. Current Electricity: Charges in Motion

Current electricity is the controlled flow of electric charges along a path. Unlike static electricity, current electricity can be safely harnessed to power devices like light bulbs, appliances, and cell phones.

                 ┌── Closed Circuit (Complete path ──> Energy flows ──> Light ON)

Electric Circuit 

                  └── Open Circuit   (Broken path   ──> Flow stops    ──> Light OFF)

The Components of a Circuit

• Power Source: Supplies energy (e.g., a battery or wall outlet).

• Conductor: Provides a path for electrons to flow (e.g., copper wire).

• Switch: Controls whether the path is open or closed.

  • Closed Circuit: The path is continuous and unbroken. Electric current flows and powers the device.

  • Open Circuit: The path is broken (like turning off a light switch). The flow of electricity stops.

3. Conductors vs. Insulators

Materials interact with electrical currents in two very different ways:

Material Type What It Does Common Examples Everyday Uses

Conductors Allows electric current to flow easily Metals (Copper, Silver, Aluminum) Wiring inside cords and circuit boards

Insulators Blocks electric current from flowing Rubber, Plastic, Glass Plastic outlet plates and rubber wrapping on cords to prevent shock