Chegg Guided Solutions for Electricity and Electronics 10th Edition: Chapter 12.3

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  • Step 1 of 4

    The following are the four special transformer applications:

    1. Lighting ballast:

    Ballast is a special type of transformer which is used in electrical discharge lighting systems like fluorescent light and mercury vapor lamp. The following are the two jobs of the lighting ballast:

    1. It starts the lamp by creating an arc through the lamp with necessary level of voltage.

    2. It also has the capability to limit the current flowing through the lamp.

  • Step 2 of 4

    2. Coupling transformer:

    Coupling transformers are used between different stages in an amplifier in order to provide isolation between sections of the amplifier but not either to raise or lower the voltage value. The isolation is so useful in the design of an amplifier that a section of the amplifier does not interfere with other sections. This kind of process adopted in the design of an amplifier is usually referred to as impedance matching.

  • Step 3 of 4

    3. Isolation transformer:

    The windings in the isolation transformer are not physically joined and they have only a magnetic coupling between them. This isolation transformer can isolate the power supply from the rest of the electrical system and can suppress the unwanted voltage spikes that are caused by the switching inductive circuits.

  • Step 4 of 4

    4. Automobile ignition coil:

    The ignition coil used in the automobile is a form of auto transformer and it produces a high voltage spark in an electrical system of automobile. The 12 volt on the primary side of the autotransformer produces 30,000 volts or more on the secondary side of the autotransformer which will be applied across the spark plug.

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