required practical resistance

• What equipment is used in the resistance practical?

  • Battery
  • Ammeter
  • Voltmeter
  • Length of wire
• How do you measure the current in the circuit?

  Using an ammeter
• How do you calculate resistance in the circuit?

  Resistance = Potential difference / Current
• What does the experiment focus on regarding the wire?

  The length of the wire
• How is the length of the wire increased in the experiment?

  By moving the crocodile clips apart
• What does a straight line graph through zero indicate?

  Resistance is directly proportional to length
• What is a zero error in measurements?

  A reading when the value should be zero
• Why is zero error considered a systematic error?

  It cannot be reduced by repeating measurements
• How should zero error be addressed in resistance readings?

  By subtracting it from all readings
• What causes zero error in this experiment?

  Contact resistance and clip positioning
• What effect does heating have on resistance?

  Increases resistance
• How can heating effects be reduced in the experiment?

  Use low potential difference and turn off current
• How does a variable resistor work?

  • Contains a long piece of wire in a coil
  • Slider changes the length of wire in the circuit
  • Controls potential difference across the load
• What happens to the lamp when resistance is increased using a variable resistor?

  The lamp becomes dimmer