Martin is constructing an electrical circuit. He notices that all electrical metal wires are covered with plastic. Electrical metal wires are covered with plastic because plastics are good

Options

A. Electrical conductors
B. Electrical insulators
C. Heat generators
D. Heat absorbers

Answer

To solve the question about why electrical metal wires are covered with plastic, we can break it down into the following steps:

### Step 1: Understand the Purpose of the Wires
- Martin is constructing an electrical circuit, which means he is working with electrical wires that conduct electricity.

### Step 2: Identify the Material of the Wires
- The wires are made of metal, which is a good conductor of electricity. This means that electricity can easily flow through them.

### Step 3: Recognize the Need for Insulation
- While metals are good conductors, they can also pose a risk of electric shock if someone touches the exposed wires. Therefore, there is a need for insulation to protect users from electric currents.

### Step 4: Identify the Insulating Material
- The wires are covered with plastic. Plastic is a non-conductive material, meaning it does not allow electricity to pass through it. This property makes plastic a good insulator.

### Step 5: Conclusion
- The reason electrical metal wires are covered with plastic is that plastics are good insulators. This prevents electricity from escaping the wires and protects people from electric shocks.

### Final Answer
- Therefore, the correct answer is **B. Electric insulators**.

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