Firstly, i have a meter that i don't know what it is. Perhaps the second question will help determine what it is...
At this point, i'm at chapter 5 section 3 of the book, and i have some sort of beginners electronics kit. I lost the manual to it some time ago, and i'm trying to learn electronics from scratch. Anyway...
I connected the 1.5v battery to the unknown meter. It goes off the scale. So, i throw a 4.7KΩ resistor on there, so it lands right about 10 on this unknown scale on the meter. I short circuit the thing over a "key" switch, so it drops down to a little over 5 (or 6 depending on whether you go by the blue line or black line) on the scale when i close the circuit. This leads to the first problem. Obviously this isn't an ohmmeter, but either an ammeter or voltmeter. Since, voltage is consistent across circuits, this can't be a voltmeter, because i'm seeing change.
However, when i put the short over a 4.7KΩ resistor, it suddenly doesn't change on the meter when i press the key down. I swap the plugs on the resistors just to be sure that it isn't a bad resistor, and it's the same thing. Further curious, i move the short onto the 2.2KΩ resistor, and it still doesn't move the needle on the uknown meter. I test a bunch of other resistors, even trying the 100Ω resistor, and no change.
So, first question, "What meter do i have?" Second question, "why does the needle move with a negligible resistance wired short but not with a 100Ω resistor added to the short?"
At this point, i'm at chapter 5 section 3 of the book, and i have some sort of beginners electronics kit. I lost the manual to it some time ago, and i'm trying to learn electronics from scratch. Anyway...
I connected the 1.5v battery to the unknown meter. It goes off the scale. So, i throw a 4.7KΩ resistor on there, so it lands right about 10 on this unknown scale on the meter. I short circuit the thing over a "key" switch, so it drops down to a little over 5 (or 6 depending on whether you go by the blue line or black line) on the scale when i close the circuit. This leads to the first problem. Obviously this isn't an ohmmeter, but either an ammeter or voltmeter. Since, voltage is consistent across circuits, this can't be a voltmeter, because i'm seeing change.
However, when i put the short over a 4.7KΩ resistor, it suddenly doesn't change on the meter when i press the key down. I swap the plugs on the resistors just to be sure that it isn't a bad resistor, and it's the same thing. Further curious, i move the short onto the 2.2KΩ resistor, and it still doesn't move the needle on the uknown meter. I test a bunch of other resistors, even trying the 100Ω resistor, and no change.
So, first question, "What meter do i have?" Second question, "why does the needle move with a negligible resistance wired short but not with a 100Ω resistor added to the short?"