P1 resistor in series and parallel

• What should you be able to determine by the end of the video?

  Total resistance of resistors in series
• What is the relationship between resistors in series?

  Resistors in series add together
• How do you calculate the current in a circuit with a 100 ohm resistor and a potential difference of 5 volts?

  Divide potential difference by resistance
• What is the total resistance of a 100 ohm and a 50 ohm resistor in series?

  150 ohms
• Why do resistors add in series?

  Current passes through each resistor sequentially
• What is the current in a circuit with a potential difference of 20 volts and a total resistance of 150 ohms?

  0.13 amp
• What is the total resistance of a 20 ohm, 15 ohm, and 10 ohm resistor in series?

  45 ohms
• How do you calculate the current with a potential difference of 10 volts and a total resistance of 45 ohms?

  Divide potential difference by total resistance
• What is the potential difference across resistors with a total resistance of 275 ohms and a current of 0.5 amp?

  137.5 volts
• What is a key fact about the total resistance of two resistors in parallel?

  It is less than the smallest resistor
• If one resistor in parallel has a resistance of 150 ohms and another has 200 ohms, what can be said about the total resistance?

  It is less than 150 ohms
• Why does total resistance decrease in parallel circuits?

  More pathways for current to flow
• What are the steps to calculate current in a circuit?

  1. Identify potential difference (V)
  2. Identify resistance (R)
  3. Use the formula: Current (I) = V / R
• What is equivalent resistance in series circuits?

  • Total resistance is the sum of individual resistances
  • Current flows through each resistor sequentially
• What are the differences between resistors in series and parallel?

  • Series: Total resistance increases, current is the same
  • Parallel: Total resistance decreases, current divides among paths
• How do you calculate potential difference in a circuit?

  • Use the formula: Potential Difference (V) = Resistance (R) * Current (I)
• What is the significance of the smallest resistor in parallel circuits?

  • Total resistance is always less than the smallest resistor
  • Indicates increased current flow through the circuit