Answer :
Final answer:
To test for DC voltage, choose the appropriate rotary dial setting based on the voltage range. Start with the highest range and gradually decrease until a readable value is shown on the voltmeter. Avoid exceeding the selected range.
Explanation:
When testing for DC voltage, the appropriate rotary dial setting depends on the range of the voltage being measured. The voltmeter typically has multiple settings such as 2V, 20V, 200V, etc. To select the correct setting, start with the highest range (e.g., 200V) and gradually decrease until the needle on the voltmeter reaches a readable value without exceeding the selected range. For example, if you expect the DC voltage to be around 12V, you would start with the 200V range and select a lower range if the needle is barely moving.
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