what is the sensitivity of a d'arsonval ammeter?
344162
It depends upon the design of the particular meter and is specified by the manufacturer as the amount of current required for full-scale deflection of the meter. This commonly falls in the microamp or millamp range.\n\nAn external resistor called a shunt may be placed in parallel across the meter to multiply its full-scale range by several magnitudes for measurement of much larger currents using the same meter.\n\nWK
388634
Inductive reactance can be calculated using this formula: XL = 2πfL\n\nGood Luck
765637
Very simple circuit, the two power supplies are used to maintain an electric equilibrium.\nThe potentiometer is used to adjust the sensibility.\nThe transistor amplifies the signal when the person lies, he or she reduces her or his resistance, and the transistor amplifies the signal, the meter instrument shows the result.
313810
It may depend on the frequency or sampling rate that you want to achieve.  One possibility is to use an oscilloscope on a current sensing shunt or current sensing toroid.  This will give you a visual representation.\n\nIf you are looking for a peak current, you can use a digital multimeter with a peak hold feature, but keep in mind that you will be limited to the maximum response time of that meter.
516885
specs of machine should tell you the accuracy.  Probably +-10% minimum.
130396
Yes. You'll need a lemon, a galvanometer or Vmeter, 2 stiff copper wires, a large paper clip, and scissors.\nStrip the insulation off on the ends of the wires. Untwist the paper clip and twist the end of one of wires around it. Squeeze and roll the lemon to loosen the pulp inside. Make two small cuts in the skin of the lemon an inch or so apart. Insert the bare wire and the paper clip through these cuts into the juicy part. The two wires should be close but not touching. Connect the free ends of the two wires to the terminals of the meter.\n\nNow watch the meter move!\n\nExplanation: Electrochemistry causes the two different metals (the copper wire and the iron clip) in the acid (lemon juice) to draw electrons away from one wire towards the other. They flow out of the lemon through one wire, go through the meter and then enter the lemon by the other wire.\n\nYou can even try to make your own galvanometer (an instrument designed to detect electrical currents) if one isn't available to you. You'll need a compass, 15 feet of bell wire (hardware store), and a small rectangular cardboard tray. Place the compass in the cardboard tray. Scrape off 1/2" of insulation from each end of the bell wire. Starting 6" from one end, wind the wire tightly around the box, circling it at least two dozen times. Leave another 6" of wire free on the other end of the tray. Rest your homemade galvanometer on the table horizontally and turn it until the compass needle is parallel to the coil of wire. Use these bell wire ends to attach to your lemon and paper clip.\nIt's fun!
841558
could be several reasons;\n\nif the material you're weighing is volatile and is evaporating you will find it impossible to get an accurate weight, further the fumes migh condense later at muck up the weighing mechanism,\n\nalso if the material contains solvent that is evaporating, or if its degrading by loss of gas or whatever you wont get an accurate reading\n\nI suppose that if the sample is hot it will conduct heat through the scale mechanism which might damage it - these instruments are very sensitive\n\nim sure there's lots of other reasons but these are the fiirst that come to mind\n\nhope this helps
1176031
an anameter  -it is used fr measuring current passing through the circuit.\n\n conical flask -its flat bottemed used to hold liquids in reactions where heating is not required.\n\nburette -used to add one solution to another and also acurately measures the amount of liquid used.\n\ndropper pipette -used to add small but accurate amount of liquid to another.\n\nfunnel - used to carry out filtration.\nboiling tube-made of thick resistant glass used fr strong heating.\n\nround bottemed flask-used to hold liquids in reations where heating is required.\n\nwatch glass-holds solids\n\nevaporating dish-it can be gentely heated\n\nmortar and pestle-fr grinding and mixing solids\n\ngud luck!hope it helps
1000421
Every gas has a unique breakdown voltage – the electric field at which it is ionized – and ionization sensors identify gases by measuring these voltages. The concentration of the gas can be determined by measuring the current discharged in the device. However, existing sensors are bulky, consume lots of power and require “risky” high voltages to operate.\n\nThe researchers also found that the current discharged in the device was six times higher than in conventional electrodes, which makes the detector highly sensitive. It is able to detect concentrations of gas as low as 10-7 moles per litre. Moreover, it can distinguish between different gases in a mixture and is not affected by external factors such as temperature or humidity – unlike previous detectors. \n\nGas-analysis vacuum sensors are virtually quadrupole mass spectrometers, with which the molecular density of a gas components and the equivalent partial pressure can be determined. The density of the gas composition can be then easily translated into total pressure.\n\nand believe me the smoke sensors works almost same as these gas detectors so plz refer to the article below
196298
a thermometer for temperature, but for tenperature i don't know.
764277
during and distructive test, danger exists. knowlege of the equiptment and proceedures are a must. if the exact failure point is to be measured, then at yield the test should be slowed. It will also minimise flying samples.
1091879
You DONT test continuity on HOT wires. The power must be off before making a continuity measurement. any meter will do then.
1079800
in one case you have half an ohm, in the other you have over 500 ohms.  It seems you may be reading one of the meters incorrectly.  One of the meters could be set to auto, while the other is not.
206184
Galvanometer;An Instrument used to Detect or Measure small electric currents by means of mechanical effects produced by an Induction Coil. Ammeter; An Instrument that measures Electric Current by being actively connected to an Electrical Circuit.
1146491
Look for caliper (spelling counts).  Specifically, Vernier Caliper, and micrometer.  \n\nThose are the two major precision measuring tools.  Try the starrett.com web site.  They have a sterling reputation for quality.
96567
got a dandy.....even though  it  seems  difficult   youll  break through  and  find  out  you can  almost  measure  anything....try  this  because  i dont  know  what  type  of  equipment  you have....in  search  bar  go.....vernier  read .. hit search..the  NTNU site java  is  excellentyou you can  even  practice  measuring  on  line.....reading  a  vernier  is  good too.....check  them  all
55180
a multimeter, junior! do your own homework!