A voltage divider comprises two 100 kΩ resistors and a 12 V source. What output voltage results from attaching a 1 MΩ load resistor?
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Answer: D. 5.7 V
Explanation
Attaching the load resistor places it in parallel with the lower divider resistor. Parallel combination lowers the equivalent resistance of that specific lower circuit branch. Lower branch resistance decreases the voltage drop across those output terminals to 5.7 V. Voltage dividers split supply voltages proportionally among series-connected resistive components. Parallel resistors always yield an equivalent resistance smaller than the individual resistors. Ohm's law governs current and voltage relationships in complex resistive networks.
Designing voltage reference circuits requires calculating load effects to prevent voltage errors. Multimeter voltage measurements can be affected by the internal resistance of the meter. Sensor interfaces must account for load impedance to ensure accurate signal transmission. Zero point fifty-seven volts is a mathematical error resulting from incorrect parallel calculations. Six volts assumes an unloaded divider where resistance values split the source equally. Twelve volts represents the total source voltage rather than the divided output level.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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