Exam-style question
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What is the output voltage of a potential divider with a total resistance of 100 Ω, where one resistor is 40 Ω and the other is 60 Ω, when connected to a 12 V supply?.
- A.4.8 V
- B.7.2 V
- C.12 V
- D.8 V
Model answer
What a good answer should say
- 4.8 V
Explanation
Why this works
The output voltage (V_out) can be calculated using the formula V_out = V_supply x (R2 / (R1 + R2)). Here, V_supply = 12 V, R1 = 40 Ω, and R2 = 60 Ω.
Substituting the values: V_out = 12 V x (60 Ω / (40 Ω + 60 Ω)) = 12 V x (60/100) = 4.8 V. Thus, the output voltage is 4.8 V.
Common mistake
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