Answer / alok

we know that ammeter has ideally zero resistance so if we connect it in parallel with the ckt then it will short ckt the device in which we are measuring the current.
and we know that voltmeter has large resistance so if we connect it in series then it will open the ckt and will prevent the flow of current.

Answer / hussain

The reason is because current is a measurement of flow - how many electrons are passing through the wire, whereas voltage is a measure of the difference is energies between two points.

In order to measure the amount of electrons passing through a wire, you actually have to place the multimeter within the flow. To measure flow, the multimeter places a VERY LOW resistance into the circuit and measures the voltage drop across that resistance. By using a very low resistance, the multimeter has a negligible impact on the circuit when placed in series.

In order to measure the energies between two points, the multimeter is place in parallel in the circuit with a HUGE resistance and measures the current through the resistance. By using a huge resistance, the multimeter has a negligible impact on the circuit when placed in parallel.

Note: when placing a multimeter into a circuit in series with it turned to the voltage setting or in parallel with the current setting, you will either destroy the multimeter or trigger the circuit breaker or fuse

why use 4-20mA in the field of instrumentation?

8 Answers  

---

Hook up resistance decade box to temp.transmitter.

0 Answers   CCIE,

---

how to measured k type thermocouple temp.

3 Answers   NTPC,

---

A length of steel pipe is used to carry sea water to a desalination plant. An adequate corrosion allowance must be specified and indicated in the piping specification, which affects the _________________________ of the pipe

0 Answers  

---

how to calibrate electro pneumatic positioner 8013 mil controls ltd ?gsr

0 Answers  

---

Positioner usage.

0 Answers   CCIE,

---

How will you calibrate an interface level trol/normal level trol in line and in w/s?

1 Answers   CCIE,

---

Explain why plc require in analog input 4-20amp & 0-10 volt?

0 Answers  

---

draw the characteristics of chebyshev filter

0 Answers  

---

WHAT IS DOPPLER EFFECT? WHERE IT IS APPLIED?

1 Answers  

---

In most instances, Inertia processes are quite uncommon. Give an example of a combined Resistance and Capacitance situation.Describe an application, which according to your understanding of the subject matter, comprises of both Resistance and Capacitance effects.

0 Answers  

---

Steve said that "An eddy-current probe works by passing an alternating current through a coil of wire and measuring the coil’s impedance" while we are using -24 Volt DC , So I am confused about DC and AC. Plz .

2 Answers   Jindal, Sadara Chemicals,

---