Exam-style question
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A potential divider circuit is used to control the brightness of a lamp. If the total voltage supplied is 12 V and the resistance of the lamp is 6 Ω while the other resistor is 6 Ω, what is the output voltage across the lamp?.
Model answer
What a good answer should say
- The output voltage across the lamp is 6 V.
Explanation
Why this works
This question tests the application of potential dividers in practical contexts. The output voltage can be calculated using the formula V_out = (R_lamp / (R_lamp + R_other)) * V_total.
Substituting the values gives V_out = (6 / (6 + 6)) * 12 = 6 V. This demonstrates understanding of voltage division in a potential divider circuit.
Common mistake
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