1 / 8

Ch. 21 - Electricity

Ch. 21 - Electricity. II. Electric Current (p.598-599) Circuit Potential Difference Current Resistance Ohm’s Law. A. Circuit. Circuit closed path through which electrons can flow. A. Potential Difference. Potential Difference (voltage)

basia-cash
Télécharger la présentation

Ch. 21 - Electricity

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. Ch. 21 - Electricity II. Electric Current (p.598-599) Circuit Potential Difference Current Resistance Ohm’s Law

  2. A. Circuit • Circuit • closed path through which electrons can flow

  3. A. Potential Difference • Potential Difference (voltage) • difference in electrical potential between two places • large separation of charge creates high voltage • the “push” that causes e- to move from - to + • measured in volts (V)

  4. B. Current • Current • flow of electrons through a conductor • depends on # of e- passing a point in a given time • measured in amperes (A)

  5. Copper - low resistance Tungsten - high resistance C. Resistance • Resistance • opposition the flow of electrons • electrical energy is converted to thermal energy & light • measured in ohms ()

  6. C. Resistance • Resistance depends on… • the conductor • wire thickness • less resistance in thicker wires • wire length • less resistance in shorter wires • temp - less resistance at low temps

  7. E. Ohm’s Law • Ohm’s Law V: potential difference (V) I: current (A) R: resistance () V = I × R • Voltage increases when current increases. • Voltage decreases when resistance increases.

  8. V R I E. Ohm’s Law • A lightbulb with a resistance of 160  is plugged into a 120-V outlet. What is the current flowing through the bulb? GIVEN: R = 160  V = 120 V I = ? WORK: I = V ÷ R I = (120 V) ÷ (160 ) I = 0.75 A

More Related