Definition An ammeter is an instrument that measures electric current, usually in units of amperes (or milliamps or micro amps when very small currents.

Slides:



Advertisements
Similar presentations
DIRECT CURRENT METERS THE D'ARSONVAL METER MOVEMENT
Advertisements

Unit 9 Measuring Instruments
Farah Saa’da Computer Engineering. The wattmeter : is an instrument for measuring the electric power (or the supply rate of electrical energy) in watts.
The magnitude of voltage signals can be measured by various electrical indicating and test instruments, such as meters (both analogue and digital), the.
Lecture 5 Current/Voltage Measurement Resistance Measurement.
21.2 Electromagnetism In 1820 Hans Oersted discovered how magnetism and electricity are ______________. A unit of measure of magnetic field strength, the.
Electrical Components and Circuits By Naaimat Muhammed.
1 Electronics Inductance Copyright © Texas Education Agency, All rights reserved.
Electricity and Circuits
Instrumentation and Measurement
EKT112:Principles of Measurement and Instrumentation
Electric Meters Electricity for Refrigeration, Heating and Air Conditioning 7th Edition Chapter 4 Electric Meters.
AC and DC meters.
Chapter 7 Notes.
Quote of the day.
Basic Instruments and Measurements
Electrical Fundamentals
Chapter 27 Lecture 12: Circuits.
CHAPTER 4 DC Meter. School of Computer and Communication Engineering, UniMAP Prepared By: Amir Razif b. Jamil Abdullah EMT 113: V-2008.
Electrical Indicating Devices. D'Arsonval Meter Movement.
7.2.4 Student Book © 2005 Propane Education & Research CouncilPage Identifying Procedures for Measuring Current Between Two Given Points in an.
Analogue Meters Done by : Bana makahle &. 1.Analogue display: Analogue displays have a pointer which moves over a graduated scale. They can be difficult.
Analog Meters Analog Meters 1- DC Ammeters : Shunt resistor ammeter : Here, the basic movement is a PMMC “permanent magnet movement coil ” → Galvanometer.
Chapter 19 DC Circuits.
P5 – Electric Circuits. Static Electricity When two objects are rubbed together and become charged, electrons are transferred from one object to the other.
DIRECT-CURRENT METERS
Magnetism.
Generators To explain how a generator works to produce electric current. To explain the difference between alternating and direct current.
Chapter 22 Magnetism and Its Uses.
Motors. Torque on a Solenoid N S SN e - Like poles repel, unlike poles attract. The solenoid will rotate counterclockwise.
Electromagnetism Hans Christian Oersted ( ) Discovered that moving electric charges (current) induces a magnetic field perpendicular to the flow.
Principles of Physics Meters and Motors. A wire loop placed in a uniform magnetic field experiences a turning force The loop only rotates 90˚, then stops.
Analog Meters An ammeter is a measuring instrument used to measure the electric current in a circuit.
PSAA Curriculum Unit Physical Science Systems. Problem Area Energy and Power Systems.
12.5 The Motor Principle p Magnetic Force on a Current-carrying Conductor Moving Conductors with Electricity: Magnetic Force on a Current-carrying.
 In 1820 Danish science Hans Christian Oersted accidentally discovered that electric current produces a magnetic field.  He set up compasses around.
Chapter 22 Magnetism and its uses Characteristics of Magnets Greeks experimented more than 2000 years ago with a mineral that pulled iron objects.
Motors and Galvanometers
Lesson V “Electromagnetism” Matter & Energy. S.W.B.A.T. Explain how an electric charge creates a magnetic field Explain how an electric charge creates.
Analysis of Circuits…. Power Power: represents the time rate at which energy is transformed. The transformation of 1 Joule of energy in 1 second represents.
Sanna Taking & Mohamad Nazri Abdul Halif School of Microelectronic Engineering Prepared by ALTERNATING CURRENT METERS Part 2 Syarifah Norfaezah Edited.
EMT 462 ELECTRICAL SYSTEM TECHNOLOGY
Chapter 27 Lecture 24: Circuits: II HW 8 (problems): 26.10, 26.22, 26.35, 26.49, 27.12, 27.30, 27.40, Due Friday, Nov.6.
Physical Science Chapter 18
Sanna Taking School of Microelectronic Engineering
Magnetism and Electricity Vocabulary Week 3.  S8P5c Electromagnetism: Investigate and explain that electric currents and magnets can exert force of each.
Magnetism 4 Electricity and Magnetism Related. Hans Christian Oersted Discovered that an electric current causes a magnetic field How? Connected a series.
March 2008Electrical Instrument/ sul 1 1 To Be A World Class Maritime Academy.
Electrical And Electronics Instruments
ELECTRICITY. ELECTRIC CHARGE SI unit for electric charge is Coulomb (C).
PREPAIRED BY –DEVANG S DOSHI DEEPAK CHAUHAN AMIIISH SHAH ALA OF ELECTRICAL & ELECTRONIC MEASURING INSTRUMENTS TOPIC- ANALOG INSTRUMENTS.
Analog dc ammeter اعداد فراس محمود الحجه عبد الرحمن علان.
Magnetism and Electricity Vocabulary 4.3
EMT 451 CHAPTER 4 DC METER Prepared by: Rosemizi Bin Abd Rahim.
ECE 3301 General Electrical Engineering
Measuring Instruments
Analog Meters 1- DC Ammeters : Shunt resistor ammeter :
Magnetism and Electricity Vocabulary On-Level
By :- ARUN KUMAR TGT-WE KV NO-1, HBK DEHRADUN
Unit 9 Measuring Instruments
EMT 462 ELECTRICAL SYSTEM TECHNOLOGY Chapter 4: AC Meters By: En. Muhammad Mahyiddin Ramli.
Electrical Engineering Technology EE306
4 ways to boost electromagnet power Circuit diode Inverse direct
Magnetism and Electricity Vocabulary 4.3
In 1820 Hans Oersted discovered how magnetism and electricity are connected. A unit of measure of magnetic field strength, the oersted, is named after.
Magnetism and Electricity Vocabulary On-Level
In 1820 Hans Oersted discovered how magnetism and electricity are connected. A unit of measure of magnetic field strength, the oersted, is named after.
Magnetism from Electricity 18.2
Instruments & Electrical Measurements Lecture 10
Analog And Digital METERS (14MARKS)
Presentation transcript:

Definition An ammeter is an instrument that measures electric current, usually in units of amperes (or milliamps or micro amps when very small currents are involved). Both the magnitude of direct current (DC) and alternating current (AC) can be measured, though with ammeters of different types. An ammeter is an instrument that measures electric current, usually in units of amperes (or milliamps or micro amps when very small currents are involved). Both the magnitude of direct current (DC) and alternating current (AC) can be measured, though with ammeters of different types.

The earliest design of an ammeter The earliest design of an ammeter was invented by a french guy called D'Arsonval in The earliest design of an ammeter was invented by a french guy called D'Arsonval in It was called galvanometer and was a mechanical device It was called galvanometer and was a mechanical device

Diagram

Basic types of Ammeter There are two basic types of ammeters. There are two basic types of ammeters. 1. The moving coil ammeter 1. The moving coil ammeter 2. The moving iron or moving magnet ammeter 2. The moving iron or moving magnet ammeter

Principles of Ammeter Both versions use a principle discovered by Hans Christian Oersted in 1820, which holds that an electric current in a wire produces a magnetic field. Both versions use a principle discovered by Hans Christian Oersted in 1820, which holds that an electric current in a wire produces a magnetic field. The magnetic field exerts a force on a coil, making it turn. The magnetic field exerts a force on a coil, making it turn. A pointer that is attached to the coil or magnet also moves, allowing the measurement to be read off the scale. A pointer that is attached to the coil or magnet also moves, allowing the measurement to be read off the scale.

Principles of Ammeter The moving coil ammeter has three basic parts: a permanent magnet, a coil, and a coil spring. The moving coil ammeter has three basic parts: a permanent magnet, a coil, and a coil spring.

Principles of Ammeter When current is passed through the coil it creates a magnetic field that is opposite that of the permanent magnet, causing the coil, and its attached pointer, to pivot. When current is passed through the coil it creates a magnetic field that is opposite that of the permanent magnet, causing the coil, and its attached pointer, to pivot. The coil spring not only limits the distance the coil can rotate, but the amount of tension it exerts depends on the strength of the force turning the coil. The coil spring not only limits the distance the coil can rotate, but the amount of tension it exerts depends on the strength of the force turning the coil.

Working of An Ammeter An ammeter is placed in series with a circuit element to measure the electric current flow through it. An ammeter is placed in series with a circuit element to measure the electric current flow through it. The meter must be designed offer very little resistance to the current so that it does not appreciably change the circuit it is measuring. The meter must be designed offer very little resistance to the current so that it does not appreciably change the circuit it is measuring.

Working of An Ammeter A small resistor is placed in parallel with the galvanometer to shunt most of the current around the galvanometer. A small resistor is placed in parallel with the galvanometer to shunt most of the current around the galvanometer. Its value is chosen so that when the design current flows through the meter it will deflect to its full-scale reading. Its value is chosen so that when the design current flows through the meter it will deflect to its full-scale reading.

Working of An Ammeter Digital ammeter designs use an analog to digital converter (ADC) to measure the voltage across the shunt resistor. Digital ammeter designs use an analog to digital converter (ADC) to measure the voltage across the shunt resistor. The digital display is calibrated to read the current through the shunt. The digital display is calibrated to read the current through the shunt.

Modern Working System Digital displays are extremely accurate and easy to operate, but they are more expensive than their electro-mechanical cousins. Digital displays are extremely accurate and easy to operate, but they are more expensive than their electro-mechanical cousins.

Uses Sometimes referred to as an ammeter, the ammeter can be utilized in a number of different fields. Sometimes referred to as an ammeter, the ammeter can be utilized in a number of different fields. The device is handy for measuring the flow of current through the wiring systems of new buildings, ensuring the wiring is up to acceptable local safety codes. The device is handy for measuring the flow of current through the wiring systems of new buildings, ensuring the wiring is up to acceptable local safety codes.

Uses Electricians will often make use of an ammeter to spot problems with wiring systems in older buildings. Electricians will often make use of an ammeter to spot problems with wiring systems in older buildings. Circuit breaker with integrated ammeter Circuit breaker with integrated ammeter In general, the ammeter can be utilized in just about any situation where it is possible to tap into a circuit and execute a measurement. In general, the ammeter can be utilized in just about any situation where it is possible to tap into a circuit and execute a measurement.

Uses Companies that manufacture electrical equipment of just about any kind will make use of an ammeter in testing the products before offering them for sale. Companies that manufacture electrical equipment of just about any kind will make use of an ammeter in testing the products before offering them for sale.

Advantages We can measure the current more accurate in the circuit. We can measure the current more accurate in the circuit. No ganger of shock by measuring current. No ganger of shock by measuring current.