# Tagged Questions

54 views

### Why does a voltmeter show voltage drop

Consider this circuit. What would I get if I measure over R1? It should be less than 12v, right? But then what volatage is LAMP1 running at? Is it still 12v, or is it the voltage I measured across ...
143 views

### Why does a voltmeter read lower across a load than across a supply?

From the Wikipedia article about series and parallel circuits: As an example, consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one ...
66 views

### Measuring Voltage and Curent Simultaneously with Probe?

I have very little experience with electricity, but I am doing a project in which I need to measure power output of solar cells. I am currently using this: ...
99 views

### Can current still be (alternatively) measured with a blown multimeter fuse?

With a blown fuse in a multimeter, is it still possible to measure current of a device by somehow measuring voltage and resistance? If so, how would this work? Do specific probing/measuring points ...
178 views

### How does a multimeter convert voltage/current to a numerical value?

Just wondering... How does a digital multimeter work ? How can it convert a voltage, a current or a resistance to a numerical value ? I guess there is some programmable chip inside, but how does this ...
1k views

### How does autoranging work in a multimeter? What is the circuit?

I was curious how this is done. It seems you would have to vary the voltage and current to measure resistance from 1ohm to 10Mohm.
310 views

### What's the low voltage displayed by a voltmeter when only one of its probes is connected?

Recently I was toying with a digital multimeter and observed the following. The multimeter was set to measuring AC voltage with the upper limit of 750 volts. It has two probes which I will call "red" ...
1k views

### Why does my multimeter's overload indicator come on during normal use?

I have a new digital multimeter (Kopp GCM-620) that has auto ranging, and an overload indicator on its LCD. When testing a mains outlet (the voltage where I live is 230V), the LCD shows a reading ...