Dasar Teknik Elektro - Seri Pembagi Tegangan

Mantan Pascasarjana
14 Apr 202527:04

Summary

TLDRThis video tutorial covers the concept of voltage dividers, focusing on how resistors in series divide voltage in a circuit. It explains both theoretical calculations and practical measurements with real circuits. Through several examples, the video demonstrates how to calculate output voltage using Ohm's Law and resistor values, along with hands-on experiments that validate the calculations. The tutorial emphasizes the importance of resistor selection to achieve desired voltage outputs and highlights the impact of adding loads to a voltage divider, showing how lower load resistance can cause significant voltage drops.

Takeaways

  • 😀 The video introduces the concept of voltage divider circuits, explaining how resistors can divide voltage in an electrical circuit.
  • 😀 The first example demonstrates how to calculate the total resistance of a series circuit and determine the current flowing through it using Ohm's Law.
  • 😀 In the first example, the total resistance of the series circuit is 30 ohms, resulting in a current of 0.4 amps and a voltage drop of 8 volts across R2.
  • 😀 Two methods are provided for calculating the output voltage across a resistor in a voltage divider, both yielding the same result of 8 volts.
  • 😀 A hands-on experiment is shown, confirming that the theoretical calculations hold up in real-world practice, with measured voltages matching expectations.
  • 😀 The second example focuses on designing a voltage divider to output 6 volts with a current of 60 mA, using two resistors of equal value.
  • 😀 Using Ohm's Law, the required resistor values are calculated to be 100 ohms for both R1 and R2 to achieve the desired output of 6 volts.
  • 😀 The second experiment demonstrates the setup with resistors of 100 ohms each and confirms that the output voltage is indeed 6 volts as calculated.
  • 😀 The third example explores designing a voltage divider to output 12 volts with a 20-volt input, calculating the resistor values needed for a current of 50 mA.
  • 😀 After calculating the total resistance of the circuit, the video demonstrates how to achieve the desired output voltage by selecting appropriate resistor values, resulting in R1 = 160 ohms and R2 = 240 ohms.

Q & A

  • What is a voltage divider and how is it demonstrated in the video?

    -A voltage divider is a circuit that splits the voltage across two resistors connected in series. In the video, the concept is demonstrated with two resistors, R1 and R2, in series with a 12V battery. The voltage across R2 is calculated and verified through both theoretical formulas and practical experiments.

  • How is the total resistance calculated for resistors in series?

    -For resistors in series, the total resistance (R_total) is the sum of individual resistances. In the example shown, R1 is 10 ohms and R2 is 20 ohms, so R_total = 10 + 20 = 30 ohms.

  • How is the current through the circuit calculated in the video?

    -The current (I) is calculated using Ohm's law, which is V = I * R. Rearranging to solve for I, we get I = V / R. With a voltage of 12V and a total resistance of 30 ohms, the current is I = 12V / 30 ohms = 0.4A.

  • How is the voltage across R2 calculated in the video?

    -The voltage across R2 is calculated using the formula V = I * R. With the current of 0.4A flowing through R2 (20 ohms), the voltage is V = 0.4A * 20 ohms = 8V.

  • What is the second method used to calculate the voltage across R2?

    -The second method uses the voltage divider formula: V_output = V_source * R2 / (R1 + R2). Substituting the values, V_output = 12V * 20 / (10 + 20) = 8V.

  • What happens when the practical setup is tested with resistors of 10 ohms and 20 ohms?

    -When the practical setup is tested, the output voltage measured is 7.3V, which is slightly lower than the calculated 8V. This discrepancy could be due to real-world factors such as component tolerances.

  • How does the video explain designing a voltage divider with specific output voltage and current?

    -The video explains that to design a voltage divider for a specific output voltage, such as 6V, and a current of 60mA, you first calculate the total resistance needed (R_total = V / I). Then, R1 and R2 are chosen such that their sum equals the calculated total resistance, and their ratio ensures the desired output voltage.

  • What are the resistor values chosen for the second practical experiment to output 6V?

    -For the second experiment, to get a 6V output with a 12V input and a 60mA current, both resistors R1 and R2 are chosen to be 100 ohms each, as this configuration splits the voltage evenly.

  • What is the effect of adding a load resistor in the voltage divider circuit?

    -Adding a load resistor to the circuit reduces the output voltage. The video demonstrates this by adding a 1000-ohm load resistor to a 20V circuit, which causes the output voltage to drop from 10V to 9.52V.

  • How does the load resistor impact the voltage output when it has a lower resistance?

    -When the load resistor has a lower resistance, such as 10 ohms, the output voltage drops significantly. In the video, the output voltage drops from 10V to 1.67V when a 10-ohm load is added to the circuit.

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Ähnliche Tags
Voltage DividerElectronics TutorialResistor CalculationPractical ElectronicsOhm's LawCircuit DesignElectrical EngineeringDIY ElectronicsTech EducationVoltage CalculationExperiment Demonstration
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