TopTechnical DictionaryAlternating current (AC)

Alternating current (AC)

Alternating current (AC) is a specific example of a periodically alternating current. The current value crosses zero, alternating between positive and negative values. The interval of time between the attainment of a definite value on two successive cycles is called the period, thus alternating current is often referred to as the periodic current. The usual waveform is a sine wave (Fig. 1).

 

Fig. 1. The graph of a single alternating voltage curve

 

General parameters defining the alternating current: period, frequency (in Hz) and amplitude. The alternating current is used in mains globally for powering devices marked with an AC or sine wave symbol. Voltage and frequency may vary by country (e.g. 110 V at 60 Hz in the US), however, it is still the periodic alternating current.

 

While the mains current is often referred to as “variable”, it is not synonymous with the alternating current. The alternating current changes both its direction and amplitude in time, while the variable current refers to any type of current that changes not only periodically, but also randomly. Variable current can be positive only.

 

Variable current includes a pulsating current (Fig. 2) and an aperiodic current (Fig. 3).

 

Fig. 2. Periodically variable pulsating current

 

Fig. 3. Aperiodic variable current

 

The alternating current can be used to directly supply incandescent light bulbs, AC motors or various power supplies. The power supplies convert alternating current into direct current to power all the other electronic devices.

 


Net:0.00 USD
Gross:0.00 USD
Weight:0.00 kg
Warranty of today's shipping if you order in time:
Especially recommended
GUARDS ROUTES PORTABLE READER PATROL-II-LCD
PATROL-II-LCD

Net: 180.59 USD

CHIMNEY CLAMP OK-50W13
OK-50W13

Net: 13.43 USD

ACCESS POINT TL-CPE210 2.4 GHz TP-LINK
TL-CPE210

Net: 42.78 USD

AHD, HD-CVI, HD-TVI, PAL CAMERA APTI-H14M-36 - 720p, 3.6 mm
APTI-H14M-36

Net: 43.59 USD

PATCH PANEL KEYSTONE PP-24/FX/C
PP-24/FX/C

Net: 14.74 USD

AHD, HD-CVI, HD-TVI, CVBS, TCP/IP DVR DS-7208HQHI-K1 8 CHANNELS HIKVISION
DS-7208HQHI-K1

Net: 211.72 USD

HDD FOR DVR HDD-WD40PURZ 4TB 24/7 WESTERN DIGITAL
HDD-WD40PURZ

Net: 111.50 USD

POE POWER ADAPTER POE-48/NX 24 W
POE-48/NX

Net: 9.55 USD

AHD, HD-CVI, HD-TVI, PAL VANDALPROOF CAMERA APTI-H24V3-2812W - 1080p 2.8 ... 12 mm
APTI-H24V3-2812W

Net: 45.25 USD

 
60-713 Poznań, Graniczna 10
tel.: +(48) 61 864 69 66
e-mail: shop@delta.poznan.pl
Working hours
Mon.-Fri.: 8.00 - 19.00
Sat.: 8.00 - 14.00
Sales Department, Shipments
tel.: +(48) 61 864 69 66
e-mail: shop@delta.poznan.pl
Technical Support
tel.: +(48) 61 864 69 98
e-mail: support@delta.poznan.pl
(c) 2001-2019 DELTA