Circuit Fundamentals — question 4 of 10
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You built a simple voltage divider from two 100kohm resistors across a 10V supply to get a 5V midpoint. Measuring it with a multimeter, you read 5V exactly as expected. But when you connect that same midpoint to a microcontroller's ADC input pin, the reading drops to about 3.3V. Walk through why this happens and what you'd check to confirm your explanation.