In a circuit with a 9V battery and two resistors of 3 ohms and 6 ohms in paralle

Practice Questions

Q1
In a circuit with a 9V battery and two resistors of 3 ohms and 6 ohms in parallel, what is the equivalent resistance?
  1. 2 ohms
  2. 3 ohms
  3. 4 ohms
  4. 1.5 ohms

Questions & Step-by-Step Solutions

In a circuit with a 9V battery and two resistors of 3 ohms and 6 ohms in parallel, what is the equivalent resistance?
Correct Answer: 2 ohms
  • Step 1: Identify the resistors in the circuit. We have R1 = 3 ohms and R2 = 6 ohms.
  • Step 2: Use the formula for equivalent resistance in parallel circuits: 1/R_eq = 1/R1 + 1/R2.
  • Step 3: Substitute the values of R1 and R2 into the formula: 1/R_eq = 1/3 + 1/6.
  • Step 4: Find a common denominator to add the fractions. The common denominator for 3 and 6 is 6.
  • Step 5: Rewrite 1/3 as 2/6, so now we have: 1/R_eq = 2/6 + 1/6.
  • Step 6: Add the fractions: 1/R_eq = (2 + 1)/6 = 3/6.
  • Step 7: Simplify 3/6 to 1/2, so we have: 1/R_eq = 1/2.
  • Step 8: To find R_eq, take the reciprocal of 1/2: R_eq = 2 ohms.
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