Which device converts mechanical energy to electrical energy and may include internal rectification?

Which device converts mechanical energy to electrical energy and may include internal rectification?

• A. Ammeter
• B. Ampere
• C. Battery
• D. Alternator

Answer: (D)

Converting mechanical energy to electrical energy is what a generator does, and in vehicles that role is filled by the alternator. The engine drives the alternator, causing its rotor and stator to produce electrical power. The output is initially AC, and the alternator contains a diode bridge that rectifies this AC to DC inside the unit, supplying the vehicle’s electrical systems and charging the battery. A voltage regulator keeps the output at the proper level for the battery and accessories. The other items aren’t energy converters: an ammeter only measures current, and a battery stores energy rather than converting mechanical energy. An ampere is simply the unit of current.

Converting mechanical energy to electrical energy is what a generator does, and in vehicles that role is filled by the alternator. The engine drives the alternator, causing its rotor and stator to produce electrical power. The output is initially AC, and the alternator contains a diode bridge that rectifies this AC to DC inside the unit, supplying the vehicle’s electrical systems and charging the battery. A voltage regulator keeps the output at the proper level for the battery and accessories. The other items aren’t energy converters: an ammeter only measures current, and a battery stores energy rather than converting mechanical energy. An ampere is simply the unit of current.