An ammeter consists of a coil with very low resistance. when electric current flows through the coil, the coil induces a magnetic field which turns the needle.
The purpose of the permanent magnet in the moving coil meter is to measure electrical current. The coil will have a magnetic field which will react to the magnetic field of the permanent magnet. Since opposite poles attract, it will cause for the coil to move.Ê
The voltage (or 'potential') coil has the higher resistance, because it is connected in parallel with the load.
An ammeter's coil requires very little current for full-scale deflection (fsd). So, to measure a current above its fsd value, most of that current must be allowed to bypass the coil. This is achieved by placing a very low value shunt resistance in parallel with the coil ('shunt' is an archaic word for 'parallel').
By Megger testing (meggering) of the motor any one can measure the IR of the motor. MEGGER is a device used to measure IR. Analog Megger device may generate 500 volts..it gives coil to coil or coil to body IR value...it should not be less than 2 Mega ohm, generally it should be or kept more than 5 mega ohm...thanks ...DEEPAK RAJPUT
A teslameter is the instrument commonly used to measure the magnetic field strength at the center of a magnetizing coil. It is designed to detect and measure the magnetic field in tesla units.
An ammeter consists of a coil with very low resistance. when electric current flows through the coil, the coil induces a magnetic field which turns the needle.
If you have an Ohm meter you will want to measure the resistance (ohms) of the Primary and Secondary sides of the coil pack and compare your readings to the Specifications for the vehicle.
The purpose of the permanent magnet in the moving coil meter is to measure electrical current. The coil will have a magnetic field which will react to the magnetic field of the permanent magnet. Since opposite poles attract, it will cause for the coil to move.Ê
Turns in a wire coil refer to the number of times the wire loops around the core of the coil. It is a measure of how tightly wound the wire is within the coil and affects the strength of the magnetic field produced by the coil. More turns generally result in a stronger magnetic field.
If the coils pulling the contactor in, you should have negligible resistance. If the contactor is not in, then you should have open circuit. Unless your measuring the resistance of the coil, in which case it will roughly be around 30ish ohms im guessing, depends on the coil voltage
When an AC generator provides an alternating current to the coil will induce the magnetic filed around it. This is called primary magnetic field. The impedance is nothing but the opposition to the current flow. The coil will have resistance as well as inductance. When this coil is brought to near any conducting material, due to the primary magnetic filed the eddy currents will develop in the material. The magnetic filed which will induce in the material is called secondary magnetic field due to the eddy current secondary magnetic field will try to oppose the primary magnetic field due to any change in the eddy current pattern. Once primary magnetic filed gets affected in the coil definitely there will be a change in impedance in terms of resistance and inductance.You can think of eddy currents as current flowing in the wrong direction (across laminations in transformers, for example). This energy is effectively lost, causing a higher loss, increasing the resistance. Eddy currents will have a minimal effect on impedance, since this is typically much larger than the resistance (note impedance is the resistance and reactance of the coil, reactance will typically dominate).
The voltage drop across a relay coil will be the same as the coil supply voltage. If you are trying to see if the coil is good or not, remove one of the voltage supply leads and check for continuity by using an ohm meter across the coil leads. A reading will tell you that the coil is intact and not open.
The voltage (or 'potential') coil has the higher resistance, because it is connected in parallel with the load.
A engine coil has a high internal resistance, the needing of a suplementar resistance may be advised to you by a car electrician, who works with such brand and model of your car.
A pickup coil for an ATV may be tested by measuring the resistance across the coil's electrical leads and comparing this value against the expected range specified in the ATV's shop manual.# Disconnect the pickup coil assembly from the ignition system (e.g. the CDI unit or engine control module) # Identify the coil's electrical contacts on the connector # Measure the electrical resistance between the coil's contacts with an Ohmmeter or digital volt meter.Take care not to grab both leads of your ohmmeter with your fingers while measuring this value or you'll measure your body's resistance in parallel with the coil. It's not dangerous but it might corrupt your reading.The value for working part will vary by manufacturer and model, but will typically be between 100 ohms and 350 ohms.If the coil reads as an "open circuit", or the resistance in the high 10's of k-ohms or higher, your coil is damaged and likely non-functional.
Critical field resistance is the limiting resistance, above which a field will not excite