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Why will one soft iron core in a coil heat up while another similar core with same coil and current not heat up. Could this problem be due to the AC frequency?
Wiki User
∙ 15y ago
Assuming the coils have the same numbers of turns of wire ( and hence should produce the same instenity of magnetic feild ) the coil that heats up may have a higher magnetic reluctance, hence dissapates more of the magnetic energy as heat. Examine the cores closely , laminated cores ( one made of plates ) tend to have a lower magnetic reluctance.
Wiki User
∙ 15y ago
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What is ac energy?
That probably refers to an AC current or an AC voltage. That means that the electrical current is not continuously flowing in one direction, but changes direction all the time - typically at a frequency of 50 or 60 cycles per second in the case of household current. Similar for the voltage.
How are sound energy and light energy similar?
they both have a wavelength and frequency *study island*
How can electricity travel through air?
1) If the voltage per meter is very high, the isolation of air may "break", and a strong current may flow. 2) There may be a current, without the movement of charges in part of a circuit, through an effect known as capacitance: charges that build up on one side of a vacuum, or air, may induce the build-up of an opposite charge on the other side. If the current has a high frequency, such a capacitor will have a low impedance (this is similar to a resistance) to the current.
How is frequency calculated?
Frequency is calculated by dividing the number of occurrences of an event by the time total time that you measured the experiment. This gives frequency units of Time^-1. When discussing waves (sound waves, x-rays etc...) , the frequency is measured using the following equation 1/(time between crests or troughs or any similar point on the wave)
What is an intense focused light of similar wavelengths?
A LASER is very intense. It only has one frequency of light. It can be spread out and focused using lenses.
How is a frequency table different from a line plot how are they similar?
How is a frequency table different from a line plot how are they similar? Read more:
How can one tuning fork's vibrations cause another tuning fork to vibrate?
Vibrations are transferred from one to the other through the air. If the two have the same frequency (or a very similar frequency), resonance will occur.
What is ac energy?
That probably refers to an AC current or an AC voltage. That means that the electrical current is not continuously flowing in one direction, but changes direction all the time - typically at a frequency of 50 or 60 cycles per second in the case of household current. Similar for the voltage.
Which is the result of visible light absorbed by a metal?
light at a frequency similar to the absorbed frequency is emitted
Is relative frequency similar to the concept of probability?
The relative frequency of of an event is one possible measure of its probability.
What book is similar to Little Black Sambo but the boy applies the last lesson to the current problem?
Epaminondas. "Epaminondas, you ain't got the sense you were born with."
What will it be like it the year 2077?
similar to the Year 2000 problem
How are energy and light energy similar?
they both have a wavelength and frequency *study island*
What happen if 440V is connected to 220V transformer?
If the frequency is kept the same, you will overexcite the transformer, and it will draw excessive current (similar to inrush currents). Insulation tests are performed on transformers above nominal voltage, but they are performed at higher than rated frequency to keep the volts per hertz roughly equal to prevent overexciting the core.
How is problem 4 similar to a problem in which you are subtracting whole numbers?
It depends on what problem 4 is.
What causes the oscillation at a certain frequency in an inkjet printer?
I assume you mean the frequency at which the head moves back and forth. If this happens only at a certain frequency, then it sounds as if that is caused by resonance - which happens when the excitation (in this case, the head moving back and forth) has a similar frequency to the object's (the printer's) natural frequency.
What is Similar to fuse but it can be reset after they have been crippled?
A circuit breaker. It's a switch that 'trips' on current overload - but it can be reset when the problem has been fixed. A fuse is designed to be replaced once blown.
