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What is the resolution of analog readings on the Arduino Uno?

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What is the resolution of analog readings on the Arduino Uno?

(a) 5V/1023

(b) 3.3V/1024

(c) 5V/1024

(d) 3.3V/100

The question was posed to me in semester exam.

The question is from Analog Input Output topic in chapter Arduino Programming of Arduino

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Best answer
Correct choice is (c) 5V/1024

The best explanation: The Arduino converts all analog voltages (0V to 5V or 3.3V) taken as input into a range of 0 to 1023. This is done by mapping the voltage levels. On the Arduino Uno the maximum voltage level is 5V and the onboard ADC has a resolution of 10 bits which means it can divide the analog signal it receives into 210 levels.

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