In a series circuit with a 24V source and two resistors of 4Ω and 8Ω, what is th

Practice Questions

Q1
In a series circuit with a 24V source and two resistors of 4Ω and 8Ω, what is the voltage across the 8Ω resistor?
  1. 16V
  2. 8V
  3. 12V
  4. 4V

Questions & Step-by-Step Solutions

In a series circuit with a 24V source and two resistors of 4Ω and 8Ω, what is the voltage across the 8Ω resistor?
  • Step 1: Identify the total voltage in the circuit, which is given as 24V.
  • Step 2: Identify the resistors in the circuit. We have R1 = 4Ω and R2 = 8Ω.
  • Step 3: Calculate the total resistance in the circuit by adding the two resistors: Rtotal = R1 + R2 = 4Ω + 8Ω = 12Ω.
  • Step 4: Use the voltage division formula to find the voltage across the 8Ω resistor: V8Ω = Vtotal * (R8Ω / Rtotal).
  • Step 5: Substitute the values into the formula: V8Ω = 24V * (8Ω / 12Ω).
  • Step 6: Simplify the fraction: 8Ω / 12Ω = 2/3.
  • Step 7: Multiply 24V by 2/3 to find V8Ω: V8Ω = 24V * (2/3) = 16V.
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