Resistors in Series and Parallel Circuits Experiment - GCSE Physics Required Practical

Physics Online
7 Jan 202103:52

Summary

TLDRThis educational video demonstrates how to measure the resistance of resistors in series and parallel circuits. The experiment uses identical resistors, two cells for power, an ammeter, and a voltmeter. It begins by testing a single resistor, recording current and voltage to calculate resistance. Then, it compares resistance when resistors are connected in series and parallel, showing how total resistance changes with different configurations.

Takeaways

  • 🔬 The experiment aims to measure the resistance of resistors in series and parallel circuits.
  • 🔌 Identical resistors are used, with their values concealed for discovery during the experiment.
  • 🔋 A simple circuit is set up using two cells with a maximum voltage of four volts.
  • 📏 An ammeter is used to check the current flow and ensure the circuit components are functioning.
  • 🔌 The first resistor is connected, and the ammeter reads a current of 0.26 or 0.27 amps.
  • 🔌 A voltmeter is connected in parallel to the resistor to measure the voltage, which reads 2.68 volts.
  • 🧮 With current and voltage known, the resistance of the first resistor is calculated using Ohm's Law (V=IR).
  • 🔄 The process is repeated with the second identical resistor to verify consistency.
  • 🔗 When resistors are connected in series, the total resistance increases, as measured by the ammeter and voltmeter.
  • 🔄 In parallel, the resistors combine to decrease the total resistance, resulting in a higher current and lower voltage across each resistor.
  • 📊 The experiment concludes with measurements for current and voltage in both series and parallel configurations, allowing for the calculation of total resistance in each case.

Q & A

  • What is the purpose of the experiment described in the transcript?

    -The purpose of the experiment is to measure the resistance of resistors both in series and in parallel configurations.

  • What is the maximum voltage the circuit can handle according to the transcript?

    -The maximum voltage the circuit can handle is four volts.

  • How many cells are used in the circuit to achieve the maximum voltage?

    -Two cells are used in the circuit to achieve the maximum voltage of four volts.

  • What instruments are used in the experiment to measure current and voltage?

    -An ammeter is used to measure current, and a voltmeter is used to measure voltage.

  • What is the initial current reading when one resistor is connected to the circuit?

    -The initial current reading is 0.26 or 0.27 amps when one resistor is connected to the circuit.

  • What is the voltage reading when the voltmeter is connected in parallel to the resistor?

    -The voltage reading is 2.68 volts when the voltmeter is connected in parallel to the resistor.

  • How does the resistance of a resistor get calculated in the experiment?

    -The resistance of a resistor is calculated using Ohm's Law, which is Voltage = Current × Resistance.

  • What happens to the current when two identical resistors are connected in series?

    -The current decreases when two identical resistors are connected in series due to the increased total resistance.

  • What is the expected change in current when resistors are connected in parallel?

    -The current is expected to increase when resistors are connected in parallel because the total resistance decreases.

  • How does the experimenter ensure that the wires are connected correctly when changing from series to parallel?

    -The experimenter ensures that the wires are connected correctly by carefully observing the connections and removing the voltmeter before making changes.

  • What is the final current reading when the resistors are connected in parallel?

    -The final current reading is between 0.47 and 0.48 amps when the resistors are connected in parallel.

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Transcripts

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関連タグ
Electrical ExperimentsResistorsCircuit AnalysisSeries CircuitParallel CircuitVoltage MeasurementCurrent MeasurementElectrical ResistanceEducational ContentSTEM Learning
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