Exam-style question
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In a potential divider circuit, if the total voltage is 10V and the resistances are 2Ω and 8Ω, what is the output voltage across the 8Ω resistor?.
- A.2V
- B.4V
- C.8V
- D.10V
Model answer
What a good answer should say
- 8V
Explanation
Why this works
Using the formula V_out = V_total * (R2 / (R1 + R2)), where V_total = 10V, R1 = 2Ω, and R2 = 8Ω. Substituting gives V_out = 10 * (8 / (2 + 8)) = 10 * (8 / 10) = 8V.
Common mistake
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