I'm confident in that i ruled out the other choices. So i am right?
You are, but can you name each device?I'm confident in that i ruled out the other choices. So i am right?
I figure the answer was B. You definitely want to turn off the power in the circuit, because it could damage the meter or cause an error in the resistance reading by producing an unwanted current in the meter.Don't answer questions that weren't asked. The question ONLY asks about obtaining the most accurate reading; it's not asking anything about the safest reading or the reading least likely to damage something.
Lower resistance scales force higher current, not lower.I figure the answer was B. You definitely want to turn off the power in the circuit, because it could damage the meter or cause an error in the resistance reading by producing an unwanted current in the meter.
As for whether you start with a high or low scale, I would start with the low scale and work my way up. Why? If there are semiconductors in the circuit, then the lower scale produces a lower voltage, which is less likely to force a semiconductor junction into conduction. Forward biased semiconductors can result in an error in resistance measurement, and that was the basis of the question.
I always thought that the higher resistance ranges often use a higher voltage battery than the one used for the low resistance ranges. At least that's how many analog meters work.Lower resistance scales force higher current, not lower.
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