Tila Tequila

how to find the power of a section of a circuit.?

I’ll be doing a practicle assessment soon for Physics where I will need to construct a circuit and find the power of a certain part of it,

Firstly what is the Power?
How is it found?
Where is it found, can it be found in wires?
How do i use a ammeter/voltmetre to find the power of any part of a circuit?

If you have a link to a good website that explains it please post that.

Help with ammeter/voltmeter?

The ammeter in the figure below reads 315 mA. Find the battery’s internal resistance r and the reading of the voltmeter V.
(Take R1 = 4.3 Ω and R2 = 1.9 Ω. When entering units, use ohm for Ω.)
r =
V =

Figure:

http://www.webassign.net/colfunphys1/20-p-030-alt.gif

Please Help!!

Calculating resistance to achieve a full-scale deflection in an ammeter?

Assume that a galvanometer has an internal resistance of 70.0 and requires a current of 0.600 mA to produce full-scale deflection. What resistance must be connected in parallel with the galvanometer if the combination is to serve as an ammeter that has a full-scale deflection for a current of 0.100 A?

I really have absolutely no clue where to start. I know that V=IR so I guess that means the terminal voltage of the galvanometer will be 0.042V, but other than that… what?
Our teacher explained the concepts but all of these questions are worded entirely different than how she would write them, so I don’t really understand.

Thanks!

Electric Problem help!!!?

A capacitor with capacitance of 10X10^-6 is in a circuit with a 200Ω and a 400Ω resistor, an E of 30 volts. The circuit has been connected for a long time [the capacitor is fully charged].

A) Find the current in the 200Ω resistor

B) where would you place an ammeter to measure current in the 200Ω resistor.

C) what is the potential across the 400Ω resistor.

D) find the power dissipated in the 400 ohm resistor.

E) What is the charge stored on capacitor?

http://imgur.com/6vMOk

Battery Voltage on BMW 525?

Ok so I’ve been having flashing lights and wasn’t sure if it was the battery or alternator. I borrowed my friends multimeter and tested the battery with the car off at 12.15 volts. Started the car and it jumps from 13.5 to 14.6 constantly. I checked the groundstrap and its secure. It looks like i may need a new battery but is this constant voltage change ok?

Two scales on a voltmeter?

Two scales on a voltmeter, which is constructed from a galvanometer, measure voltages up to 24 V and 32 V respectively. The resistance connected in series with the galvanometer is 1655 for the 24 scale and 2594 for the 32 scale.
Find the full-scale current of the galvanometer. (The full-scale current is the same in both scales.)
Answer to 2 s.f.

Where to buy Photography Filters?

Hi! So I am an ammeter photographer, and I want to purchase some photography filters, in specific IR filters. Where can I buy these? Do big shops like Best Buy and Future Shop sell these? I don’t think so… But where can I get them for a good price? Thank you so much!

Measuring resistance of wire?

I tried measuring a few cm of a wire with a multimeter and the resistance turned out to be 26 ohms and when i measured about a foot of the wire the resistance was about the same.Isnt the resistance supposed to be higher as the length of the wire increases? and i tried connecting the two wires of the multimeter and the resistance was about 25 ohms.Am i supposed to minus that reading off or is my multimeter faulty?

what\’s wrong with my Bronco?

The last two days my dash voltmeter was reading low but the truck ran fine and then occasionally so would the volt reading. As I drove tonight my truck began to chug. It felt like my truck had no power especially when I gave it gas. I drove for a few miles pulled over noticed it was fine in neutral and reverse but not in park or drive. It soon died and refused to start and a jump start did nothing. when I go to start it it will turn briefly then make a series of clicking noises and do nothing. Any ideas? Alternator? starter? Transmission?

How to test for ground loop using multimeter?

I am experiencing a hum in my audio line from my computer. I suspect it’s from a ground loop. My monitor (which house the speakers) is a 2 prong plug is plugged into a separate outlet from the power strip of which the PC is plugged into. I thought this prevents a ground loop but I would still like to test.

I just got a multimeter, and I have no idea how to use it. All the examples I see on ground loop testing are not for PC/Monitor jacks.

Can anyone give me a step by step. I have this multimeter: http://www.amazon.com/Sinometer-Manual-Digital-Multimeter-MS8268/dp/B000JQ4O2U?SubscriptionId=02B7Y8VZ2ZRE5MXHPMR2&tag=vglnk-c1001-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B000JQ4O2U