Chris Brown

Physics Question about Parallel Resistance!?

Tom has a sensitive ammeter that requires only 1.000mA of current to provide a full-scale reading. The resistance of the ammeter coil is 500.0 ohms. He wants to use the meter for a physics experiment that requires an ammeter capable of reading to 1.000 A. He has calculated that an equivalent resistance of .5000 ohms will produce the necessary voltage drop of .5000 V (V=IR=1.000 x 10 ^-3 x 500 ohms), so that only 1.000mA of current passes through the meter. What value of shunt resistor, a resistor placed in parallel with the meter, is needed?

I have a dead circuit in my house and is not the breaker?

Entire circuit died in my house. Did some testing with multimeter and found that probale cause is an open neutral somewhere in the circuit. Because all the circuit is down i figured the fault to be close to breaker box. Its not the breaker, I swapped it with known good one. I was able o jump into the crcuit pretty close to the breaker and the neutral bus. I used an alarm clock, it worked. I pulled apart junctions and recipticales and so on and found no open or any other obvious faults. Then, the circuit came back to life on its own for about 10 minutes. Any advice is appreciated, thank you.

Do I have bad body resistance?

I checked it with the voltmeter and it came out to be 0.734 Mohm’s. Is that bad?, and can you explain it.

compare and contrast a galvanometer and ammeter.?

Have you ever used a hand-held multimeter to measure the exact resistance between your temples?

Tim, you’re not a real man until you have the Fluke model with an oscilloscope screen.

A 50mV meter has a resistance of 10 ohms. A multiplier has been inserted to produce a voltmeter of range 5V?

How can the multiplier be modified so that the new meter will have range of 15V?

A question on electricity?

A milliammeter with a full scale deflection of 10mA and internal resistance 5ohms is to be modified to become an ammeter with a full scale deflection of 5.0A.
What type of arrangement of resistors and value of resistance should be connected to modify the milliammeter?
Arrangement of the resistor (with the ammeter) Value of resistance/Ohm
A. Parallel 0.01
B. Series 0.01
C. Parallel 10.00
D. Series 10.00

I really hope that you can help me with this question. My major examination is just around the corner and I still don’t know how to go about solving this question! Please help me out!! Thanks!

Gaming computer build is not starting up…?

So I got all my pieces for a budget gaming computer. The other day I started putting everything together. I got all the pieces together & wires connected & all. I plugged the power supply in & turned it on. I LED on the mobo turned on but none of the fans in the case turned on & when I press the power button on the case, nothing happens. Yes, everything is plugged in. I thought it might be an issue with the 2 pin cords for the power button, reset button, etc. but I don’t seem to see any problem with them. I have a multimeter & I was going to check the power supply, I just haven’t gotten around to it yet…

The mobo is Asus F1A75-M LE
The power supply is just a cheap 400W from Diablotek. It’s the DA series ATX power supply.
The case is the HAF 912 series from Cooler Master. At the moment, I’m just using the fans that come included in the case.

It is a possibility that the power supply is the problem due to the fact that I can not see the fan in the power supply moving when turned on, but wouldn’t that mean that the light on the mobo wouldn’t turn on either?

Thanks.
Oh, sorry. The processor is an AMD A8 Quad core 2.9 Ghz.
The RAM is HyperX 8GB DDR3 from Kingston
I’m currently using the integrated chipset included on the board. Eventually I’ll add a video card & crossfire but for now, the 1 GB is enough for SWTOR which at the moment, is all I’ll be playing.

Yeah, the power supply is what I always expected but my dad wanted to just investigate a little more to see if there was another problem. I plan on buying another one anyways from Cooler Master or as you suggested, Corsair.

Need help with subwoofer, pretty frustrated.?

I know the sub works because i hooked it up to another amp and it played.
I know the amp has power because the little green light is on.
I have RCA cables plugged into channel one (white) and channel two (red).
However, I only have speaker wire running out of channel one on the amp because I only have one sub.
When I use a voltmeter on the channel one outputs, I get a positive reading.
Then, when I attach speaker wire to the outputs, I get jack squat (sound and voltage).

I have been looking at this for like 3 days now, and its starting to get pretty annoying.

Please, please tell me what’s wrong?
Is the amp broken?
How can I tell?
I don’t have access to another sub to test it on.

what happens if digital multimeter in ammeter mode connected in parallel to power supply?