Name the materials that do not allow electricity to pass through them.

Explanation

To answer the question "Name the materials that do not allow electricity to pass through them," we can follow these steps:

### Step 1: Understand the Concept of Insulators
- Insulators are materials that do not allow electric current to flow through them. This is because they do not have free electrons that can move and carry the electric charge.

### Step 2: Identify Common Insulating Materials
- Some common materials that act as insulators include:
- **Plastic**: Widely used in electrical wiring and appliances to prevent electric shock.
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