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# Alternating current

Alternatin current history and producing

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### Alternating current

1. 1. Alper GÜNEREN - 2010512022 Uğur KARAALİ - 2010512026 1
2. 2. OBJECTIVES SHORT HISTORY GENERATION CIRCUITS ALTERNATING CURRENT 2
3. 3. HISTORY OF ALTERNATING CURRENT William Stanley, Jr. designed one of the first practical devices to transfer AC power efficiently between isolated circuits. The AC power system used today developed rapidly after 1886, and included contributions by Nikola Tesla and Carl Wilhelm Siemens. ALTERNATING CURRENT 3
4. 4. WHAT IS ALTERNATING CURRENT ?  Alternating current electricity is the type of electricity commonly used in homes and businesses throughout the world.  AC electricity is created by an AC electric generator, which determines the frequency.  An AC waveform can be sinusoidal, square, or sawtooth-shaped. Some AC waveforms are irregular or complicated. ALTERNATING CURRENT 4
5. 5. Alternating current flows first in one direction and then in the other direction. ALTERNATING CURRENT 5
6. 6. ADVANTAGES  The single greatest advantage of alternating current is that AC current can be transformed and DC current cannot be transformed.  It can be controlled by a wide range of components eg.resistors,capacitors and inductors.  This allows high-voltage electrical power to be distributed with smaller wires and lower amperage. ALTERNATING CURRENT 6
7. 7. HOW TO GENERATED ? ALTERNATING CURRENT 7
8. 8. DIRECT ALTERNATING ALTERNATING CURRENT 8
9. 9. RMS VALUES  Since voltage and current are always changing we need some way of averaging out their effect.  We use r.m.s values (root-mean-square)  The r.m.s values are the DC values which give the same average power output ALTERNATING CURRENT 9
10. 10. ALTERNATING CURRENT 10
11. 11. AC IN CAPACITORS In an AC circuit, the current can continue to flow, as the plates become alternately charged positively and negatively For both AC and DC circuits, the voltage across the resistor is related to the current by V=I.R A similar relationship exists for a capacitor: ALTERNATING CURRENT 11
12. 12. REACTANCE  Reactance is a measure of how a capacitor can limit alternating current.  It is similar to resistance but differs in that it is dependent on the frequency of the ac supply.  It also depends on the size of the capacitor. ALTERNATING CURRENT 12
13. 13. IMPEDANCE ALTERNATING CURRENT 13
14. 14. AC IN INDUCTORS .In an AC circuit, the current is always changing so the inductor is always producing an opposing voltage so is always limiting the amount of current that can flow For both AC and DC circuits, the voltage across the resistor is related to the current by V=IR A similar relationship exists for an inductor ALTERNATING CURRENT 14
15. 15. REACTANCE  It measures how well an inductor can limit alternating current  It depends on the frequency of the ac supply.  It depends on the size of the inductor ALTERNATING CURRENT 15
16. 16. IMPEDANCE ALTERNATING CURRENT 16
17. 17. PHASE RELATIONSHIP The current in the circuit will always be in phase with VR ALTERNATING CURRENT 17
18. 18. The voltage phasors are not necessarily the same size, but are always 90°out of phase. ALTERNATING CURRENT 18
19. 19. Again the voltages may be different sizes but will always be 90° out of phase ALTERNATING CURRENT 19
20. 20. RLC CIRCUITS The supply voltage is now found by adding all 3 phasors together. (VL and VC are combined into one first) ALTERNATING CURRENT 20
21. 21. RESONANCE At resonance, VL=VC and they cancel each other out. So VS=VR and if VR is at max then I is at max. ALTERNATING CURRENT 21
22. 22. REFERENCES • http://www.teachersdomain.org • http://www.peetvs.co.za • http://www.sjsu.edu • http://www.youtube.com • http://www.wikipedia.com • http://www.upscale.utoronto.ca • NCEA A.S 3.6 Text Chapters 18-19 • Yrd. Doç. Dr. Levent Çetin/ alternatif akım ALTERNATING CURRENT 22
23. 23. THANKS FOR LISTENING... ALTERNATING CURRENT END