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Why is a transformer used?
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A transformer is used to change the voltage of alternating current (AC) electricity. It's an essential device in the electrical power distribution system. Here are the main reasons for using transformers:

1. **Voltage Conversion:** Transformers can either step up (increase) or step down (decrease) the voltage. For example, electricity is generated at a low voltage but is transmitted over long distances at high voltage to reduce energy loss. Before it reaches homes or businesses, the voltage is stepped down to a safer level.

2. **Efficient Power Transmission:** High voltage allows electrical power to be transmitted over long distances with less energy loss. However, high voltage is dangerous for use in homes, so transformers bring it down to a safe level for everyday use.

3. **Safety:** By stepping down the voltage, transformers ensure that electrical systems and devices can be used safely by people.

4. **Matching Voltage Levels:** Different equipment and appliances require different voltage levels. Transformers are used to match the voltage supply to the needs of specific electrical devices.

In simple terms, a transformer helps make the electricity suitable for use in different situations, ensuring it's delivered at the right voltage for safety and efficiency.
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