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Understanding Ohm's Law: Voltage, Current, and Resistance in Series Circuits

This section explains the fundamental relationship between voltage, current, and resistance in simple series circuits, utilizing Ohm's Law. You'll learn how voltage (measured in volts), current (measured in amps), and resistance (measured in ohms) interact. Key concepts include how variations in voltage and resistance affect current flow. The section also provides practical examples of calculations using Ohm's Law formulas, highlights the importance of measuring tools like multi-meters, and discusses the function of resistors in applications.

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Understanding Ohm's Law: Voltage, Current, and Resistance in Series Circuits

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Presentation Transcript

  1. Chapter 17 Section 2: Current

  2. D4 • Explain the relationship among voltage, current and resistance in a simple series circuit.

  3. Learning Target • I can explain Ohm’s Law. • I can calculate voltage, current and resistance using Ohm’s Law.

  4. OHMS LAW

  5. What is Ohms Law? • Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R) • Used by electricians, automotive technicians, stereo installers, etc.

  6. VOLTAGE (V) It is the push or pressure behind current flow through a circuit, and is measured in (V) volts. 

  7. CURRENT Current refers to the quantity/volume of electrical flow. Measured in Amps (A)

  8. RESISTANCE Resistance to the flow of the current. Measured in Ohms

  9. Chart

  10. General Rule. 1.  Assuming the resistance does not change: As voltage increases, current increases. As voltage decreases, current decreases. 2.  Assuming the voltage does not change: As resistance increases, current decreases. As resistance decreases, current increases.

  11. How do we use Ohms Law?

  12. V = I x R I = V R R = V I

  13. How to calculate? • Battery voltage is 12V • Current? • Resistance 2 Ohm V V

  14. How to calculate? • Voltage is 12V • Current is 4 Amps • Resistance in Ohms ? V V

  15. What can we use to measure? Multi meters/ DVOM

  16. Resistors • Why do we need resistors? • To decrease the amount of voltage applied to a component • The value of the resistor is marked on the body using colored rings.

  17. Resistors

  18. Resistor color chart

  19. Learning Target Checkpoint • What is Voltage? • What is Current? • What is Resistance? • Calculations on worksheet

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