1 / 27

Voltage in Electrical Systems

UNIT 4. Voltage in Electrical Systems. Unit 4 Voltage Pages 71-76 (leave a space in between). Voltage source Conductors Control element Electrical appliance Electrical loads Electrical circuit Direct current Alternating current Volts. Primary cells Secondary cells Electrode

elaine-key
Download Presentation

Voltage in Electrical Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. UNIT 4 Voltage in Electrical Systems

  2. Unit 4 Voltage Pages 71-76 (leave a space in between) • Voltage source • Conductors • Control element • Electrical appliance • Electrical loads • Electrical circuit • Direct current • Alternating current • Volts • Primary cells • Secondary cells • Electrode • Cathode • Anode • In series • Electron • Frequency • Voltmeter

  3. Unit 4 Voltage Pages 77 • Answer # 1-8

  4. Electrical Systems • Made up of voltage sources, conductors, control elements, and appliances and machines • Batteries/generators, wire/circuits, switches, lights/appliance

  5. Conductor • Any material that allows the movement of electrical energy through it

  6. Control Element • Wall switch • Volume on a radio • Variable speed switch

  7. Electrical Load • Motor • Light Bulb • Appliance

  8. Electrical Circuit • Closed path made by connecting voltage sources, control elements, and electrical loads

  9. AC vs. DC Electricity • AC – Alternating Current • DC – Direct Current

  10. AC • Electric charges move back and forth many times a second in the wire DC • Electric charges in wires always move in one direction

  11. AC • Produced by alternators DC • Produced by batteries

  12. Typical DC Voltage Sources

  13. Dry-cell batteries • A chemical produces the voltage Wet-cell batteries • Contain a liquid electrolyte • Usually a strong acid • Used to start engines because they can deliver a lot of power

  14. The ability to recharge a battery allows us to group these chemical producers of voltage into two classes Secondary cells Primary cells • Easily recharged • Not easily recharged

  15. Primary cells & Secondary Cells

  16. How are DC Voltage sources connected? • The output of a voltage source comes from two terminals called electrodes • DC sources normally have two electrodes • A Positive and a negative

  17. How are DC Voltage sources connected? • Electrons move in the circuit as if they were flowing out of the negative electrode and into the positive • The negative electrode is called the “cathode” • The positive electrode is called the “anode”

  18. How do we produce higher voltage? • DC voltage sources can be added together in series • Positive source must be connected to the negative terminal of the other source in succession • If connected in an opposing manner it will sometimes cause battery damage

  19. Good & Bad DC Voltage Sources Good Bad!

  20. What makes up a simple DC Circuit? • How do we make schematics? • Symbols: • Battery • Light bulb • Switch • Conductors

  21. How do we make schematics? • Please make a schematic of the following simple circuit

  22. What makes up a simple DC Circuit? • How do we make schematics? • Symbols:

  23. What makes up a simple DC Circuit?

  24. AC Voltage • AC Voltage changes direction about 60 times each second • This rate of change is called the frequency • Frequency is measured in cycles per second or hertz

  25. Voltage acts like a force • Unlike charges attract • Like charges repel • There are three common ways of creating a voltage difference

  26. How do we measure voltage • Voltmeters measure the difference in volts of any two points • Sometimes voltmeters have scales of several ranges

  27. How do we measure voltage • Modern electronics have made digital voltmeters available • Oscilloscopes are used often in analyzing, testing, and troubleshooting electrical systems and circuits • They can also be used as voltmeters

More Related