0
Why relay coils produce high voltage spikes when they are switched off?
Wiki User
∙ 12y ago
When relay is turned the magnetic field that surrounds the coil collapses. When the current goes down rapidly the voltage goes up rapidly. A diode is placed across the coil, to dissipate this spike in voltage, in order to prevent damage to semiconductor components.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What happens when the magnet stops moving in a DC motor?
Nothing. The motor is not doing work. A voltage needs to be switched between the coils for it to go.
What is the different between 3phase plus N generator coil and motor coil?
Generator coils generate the voltage, motor coils use the generated voltage.
Can tesla coils generate an emp?
the coil it is used to produce high voltage, low current, high frequency alternating current electricity. A burst of electromagnetic radiation is something the coil will not do.
What is difference between 24vac and 240 v ac coil?
These are two different rating coils. I will not take 24V and 240V ac coils in this explanation, I will take low voltage ac coil and high voltage ac coil in the explanation in general. Low voltage ac coils have low insulation in general compared to the high voltage coils since we need more insulation for the high voltage coils. Low voltage ac coils have less no of turns and less diameter of coil compared to high voltage ac coils. But the thickness of the conductor used for the ac coil depends on the current rating of the coil only it does not depends on the voltage.
Why will more voltage be induced with the apparatus if an iron core is inserted in the coils?
No one knows.
What happens when the magnet stops moving in a DC motor?
Nothing. The motor is not doing work. A voltage needs to be switched between the coils for it to go.
If a magnet is put inside one coil of wire a voltage is produced. What will happen if the magnet is put inside two coils of wire?
If the magnet is put inside two coils of wire, a voltage will be induced in both coils simultaneously. The induced voltage in each coil will depend on factors such as the number of turns in the coil, the strength of the magnetic field, and the rate of change of the magnetic field.
How can a change in the voltage of a transformer's primary coil create a change in the secondary coils voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
How can a change in voltage of a transformers primary coil create a change in the secondary coils voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
Do isolation transformers stop spikes from getting in and out?
That depends on what kind of spike: AC spikes are allowed through while DC spikes (within limits) are blocked. DC Spikes that go over the capacitance rating of the transformer coils will pass through. CAUTION: Isolation transformers are dangerous, and you should know what you are doing before messing with them: most provide lethal voltage potential in an otherwise safely grounded enviroment.
What is the different between 3phase plus N generator coil and motor coil?
Generator coils generate the voltage, motor coils use the generated voltage.
If you doubled the number of coils and doubled the voltage what would be the increase in magnetic strength?
well if you doubled the coils it would be pie times the amount of voltage in the current squared
The ratio of coils on the input side of a transformer to coils on the output side is the ratio of the input voltage to the output voltage?
I think you mean 'turns' rather than 'coils' (a coil is made up of a number of turns). The answer is that, yes, the turns ratio is the same as the voltage ratio, for an ideal transformer.
How can a change in the voltage of a transformer's primary coil create a change in the secondary coil's voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
How can a change in voltage of a transformer's primary coil create a change in the secondary coil's voltage without the coils touching?
The more coils you have on one side will increase the magnetic force
What happens to the strength of an electromagnet when the voltage in the coils of the solenoid is decreased?
The greater the current in the coil, the stronger the magnetic field will grow. Conversely, lowering the battery voltage decreases the current, weakening the field.
Summary of the step-down transformer?
A step- down transformer is one whose secondary voltage is less than its primary voltage, it is used to reduce 'step down' the voltage applied to it. The number of coils in the primary circuit is greater that the secondary circuit. For instance, to step down 480 Voltage to 240 voltage, you need a step down transformer whose ratio of primary coils to secondary coils is 2:1.
