Explain why electrical wires are made of copper but the coverings of wires are made of plastic.

Explanation

### Step-by-Step Solution:

1. **Understanding Conductivity**:
- Copper is known for its excellent electrical conductivity. This means it allows electric current to flow through it very easily.

2. **Reason for Using Copper**:
- Because of its high conductivity, copper is used to make electrical wires. This ensures that electricity can be transmitted efficiently with minimal energy loss.

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