Electrical Engineering

Page 1

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AC CIRCUITS

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COMPARISON OF AC WITH DC AC

DC

1. AC stands for Alternating Current type supply.

1. DC for Direct Current type supply.

2. Polarity of supply changes periodically.

2. Polarities are fixed.

3. AC Voltage or current not only varies its direction but magnitude is varying with time.

3. Both direction and magnitude are constant.

4.

4.

5. AC can be transformed from one voltage level to other voltage level with the help of transformer.

5. DC cannot be transformed.

6. AC has frequency from low to high, e.g. mains frequency is 50Hz.

6. Frequency of DC is zero.

7. Examples of AC voltage are Audio (signal from microphone), AC power line all oscillator O/P.

7. Dry cell, battery, Rectifier etc.

ADVANTAGES OF AC

1. The nature of sound is quite similar to that of AC supply and therefore its easy transmission as well as conversion of sound to electrical signal and electrical signal to sound with AC; is the main advantages of AC. 2. The transmitted signal easily received by the method of resonance, resonance is another specialty of AC. This method of receiving radio and TV signal with the help of resonance is known as „Tuning‟. 3. AC supply can be generated by simple motor without using another electrical energy. Generator is a common example of AC supply. In vehicles like scooter, motorcycle, AC magneto is also simple in construction.

AC CIRCUITS

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Electrical Engineering by E Keeda - Issuu