Physics Coursework

[arbites_augmented]

Is ****ing confusing!

I used a voltmeter, and an ammeter to measure the Current and P.D of several wires.

I need to use the Amps reading and the P.D reading to find out the resistance, is fine. However, for the voltmeter, the setting was 'DCV 20', or 'DCV .20'. I'm not sure whether that means it's a full volt or not. Basically, I'm not sure what to use in the R=I/V equation.

Can anyone enlighten me?

Thanks, Alex.

 

[janlulhannes]

I hope this will enlight you.

 

[Tuckles]

Right. So your main problem is the use of the multitester I believe? If you're not using one, get one, it makes the job much easier, and you can check your answer with the built-in ohmmeter.

Anyway. The settings DCV 20 and DCV .20 mean Direct Current Voltage up to 20V and Direct Current Voltage up to 0.20V.

I assume you know how to check for voltage and how to check for current.

So first thing to do is check for voltage. To do that, hook up your voltmeter, and then first set it to DCV 20 (unless of course your wires are plugged into a wall socket, then set it to ACV 200 or so). After which, if the thing doesn't bat, set it to DCV 0.20 (this is doubtful, as 0.20 is a tiny voltage). If it bats the other way, reverse the connection from wire to voltmeter.

Do the same for the ammeter, I'll assume you have a 5 Ampere and a 1 Ampere option on your ammeter. Hook it up, set it to 5 amperes, then set it to 1 if it doesn't tick. If it does tick, but towards the opposite direction, reverse the connections.


Hope this helps.

 

[Ilex]

The setting always indicates the maximum voltage range measurable. So on a setting of 20DCV (direct current voltage) it would mean that the readings are in full volts; 19.99 is the highest it goes (depending on the number of numbers on the screen) and yes that means. 19.99Volts. .20DCV means it can read  maximum of 199.9 mV. So a reading of 150 would mean you had 0.15V and so on. I'd guess the range of voltage was probably in the low volts... not more than 16 (edit: apparently not ) volts anyways.

 

[arbites_augmented]

Ah, my mistake. It was 20, not .20

Ok, so for example, 0.15 means 0.15 Volts. My Ammeter was set to '10A', so I assume that means that it goes up to 10 Amperes.

I was using this Voltmeter, btw:

So what would 200m mean?

 

[Gunrunner]

200m would be 200 milli-volts

Yes volts, my mistake.

 

[arbites_augmented]

DCV?

But yeah, that's Millivolts I assume, and so I'd need to scale up. Thanks.

 

[Tuckles]

Aye, that's 200 mV. (not to be confused with MeV )

 

[Eino]

隐藏

I hope this will enlight you.