• How do you hook up a voltmeter to measure the voltage across a resistor


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    Voltmeters and Ammeters




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    The less air a pressure gauge requires to hiok, the less it will deflate the tire under test. The less current drawn by a voltmeter to actuate the needle, the less it will burden the circuit under test. This effect is called loading, and it is present to some degree in every instance of voltmeter usage. The scenario shown here is worst-case, with a voltmeter resistance substantially lower than the resistances of the divider resistors. But there always will be some degree of loading, causing the meter to indicate less than the true voltage with no meter connected.

    Obviously, the higher the voltmeter resistance, the less loading of the circuit under test, and that is why an ideal voltmeter has infinite internal resistance.

    Voltmeter hook measure up a How do you across resistor a voltage the to

    Digital voltmeters, on the other hand, often exhibit a constant resistance across their test leads regardless of range setting but not always! The astute observer will notice that the ohms-per-volt rating of any meter is determined by a single factor: To minimize the loading of a voltmeter on any keasure, the designer resiwtor seek to minimize the current draw voltmeger its movement. This can be accomplished by re-designing the movement itself for maximum sensitivity less current required for full-scale deflectionbut the tradeoff here is typically ruggedness: Another approach is reeistor electronically boost goltage current sent to the movement, so that very mwasure current needs to be drawn from the circuit under test.

    This special electronic circuit is volmeter as an amplifierand the voltmeter thus constructed is an amplified voltmeter. The internal workings of an amplifier are too complex to be discussed at this point, but suffice it to say that the circuit allows the measured voltage to control how much battery current is sent to the meter movement. The amplifier still loads the circuit under test to some degree, but generally hundreds or thousands of times less than the meter movement would by itself. Here is a photograph of a very old VTVM, with the vacuum tube exposed! Now, solid-state transistor amplifier circuits accomplish the same task in digital meter designs. I've done it a few times.

    Don't hook up the ammeter in parallel, tell you why in a minute. But what you have to do is hook it up in series. So if I wanted to know the current going through R three, I could just stick the ammeter right in here. One lead would plug into one side of the ammeter, the other lead would plug into the other side. This current would have to flow straight through the ammeter and this is telling me how much current goes through R three. It doesn't matter what side I put it on, the current going into R three will equal the current going out. So you can put it over here too, but it's gotta be hooked up in series.

    So you have to disconnect, it's kind of a pain to hook up an ammeter sometimes.

    You have to disconnect something here, then connect that connection to the one side of the ammeter, connect to the other side of the go. For a voltmeter, you didn't have to do that. For a voltmeter, just kept it out here and just touch those leads wherever you needed to touch them. But for an ammeter, you have to meaure the circuit to let this ammeter aa. But I can move it wherever I want. I could put it down here, that tells me the current in this strip. Again, ammeters always hooked up in series with the element that you're trying to measure. So this ammeter position will let me measure the current that's flowing through the battery. But why is the voltmeter always hooked up in parallel and the ammeter always hooked up in series?

    We want the ammeter to be hooked up in series because we want to measure the current through a line in the circuit. We want to measure the current flowing through this resistor. So if we want to measure the current flowing through something, we need to make sure that the current flows through our ammeter and that's how we get our reading. Because of this, people design ammeters with very little resistance. An ammeter has very little resistance. And the reason is, if you took this ammeter and it had a big resistance and you stuck it in here, you'd be changing how much current flowed through this part of the circuit.

    We don't want to do that.

    Whenever we measure something, we don't want to disturb it. Measuer when I yook my ammeter in here, I don't want to disturb how much current was going through here. I wanted to know how much current flows without my ammeter being in there. So when I put my ammeter in there, it better have very little affect on this circuit. That's why we make this ammeter have a very small resistance. And that's also why you can't hook this ammeter up in parallel, cause if you did, look at what would happen. This is why it's bad.

    You take that family, you author it over to here. I potential small, maybe on the correct of a milliohm.

    If you suspect corrosion between the battery and the starter, why not just measure the resistance? You co a multimeter. Why not just check it? The answer is twofold. First, very small amounts of resistance can have a very large effect on the amount of current that flows. Most multimeters do not measure small resistance values very accurately. Second, even if you could measure Hiw resistance accurately with the circuit unpowered, what the actual resistance value would be when hundreds of amps of current are flowing through the circuit might be dramatically different.

    But another problem is that a starter motor will draw hundreds of amps, and this is way too much current to measure with your multimeter. Remember, to do a current measurement, you need to put the meter in series with the circuit. All of the current in the circuit has to flow through the meter to capture the measurement. The voltage drop measurement To configure a multimeter to measure voltage drop, you set it up the same way as you would any other voltage measurement: Put the red probe in the socket with the V. Turn the big rotary dial to the setting for DC voltage, which is a V with solid lines over it.


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