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A 10 Ω resistor and a 20 Ω resistor are connected in series. What is the total r

Practice Questions

Q1
A 10 Ω resistor and a 20 Ω resistor are connected in series. What is the total resistance?
  1. 10 Ω
  2. 20 Ω
  3. 30 Ω
  4. 5 Ω

Questions & Step-by-Step Solutions

A 10 Ω resistor and a 20 Ω resistor are connected in series. What is the total resistance?
Correct Answer: 30 Ω
  • Step 1: Identify the resistors in the circuit. We have a 10 Ω resistor and a 20 Ω resistor.
  • Step 2: Understand that when resistors are connected in series, the total resistance is the sum of the individual resistances.
  • Step 3: Write down the formula for total resistance in series: R_total = R1 + R2.
  • Step 4: Substitute the values of the resistors into the formula: R_total = 10 Ω + 20 Ω.
  • Step 5: Perform the addition: 10 Ω + 20 Ω = 30 Ω.
  • Step 6: Conclude that the total resistance is 30 Ω.
  • Series Resistance Calculation – In a series circuit, the total resistance is the sum of the individual resistances.
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