Ac resistance and dc resistance, Electrical Engineering

Background Information

Electrical machines usually consist of copper windings on steel cores, and their AC resistance is greater than their DC resistance.

The power loss has two components which are nonlinear with frequency and flux density:

Eddy Current Loss
Hysteresis Loss

Important

The un-wired 230V terminals of the 230V:30V transformer may have 230V on them (or more if more is applied to the transformer. Caution is advised.
Limit the output from the Variac to 30V, otherwise the low-impedance load of the 230V"30V transformer will draw too much current, blowing the fuse in the Variac.

Starting Point

Configure the circuit so that the Variac feeds the isolating transformer, which in turn feeds the 30V winding of the 230V:30V transformer. Add in the meters like so:

Ensure the two scope earth leads are connected together:

Channel 1 is the voltage supplied to the magnetic load
Channel 2 is the current drawn by the magnetic load

Consider the voltage, current, power factor and waveforms at differing applied voltages (eg 5V, 10V ... 30V)
Note-taking

You should note all your measurements, thoughts, and observations.
Write-up

In writing your conclusions, and should you decide to use this lab for you finial write-up lab, consider:

What you observed
What the theory says you should have observed.
What discrepancies you encountered
What have you learned, and can you conclude from this
What problems are posed by using this in industry, and how these are addressed.

Posted Date: 3/8/2013 5:15:53 AM | Location : United States







Related Discussions:- Ac resistance and dc resistance, Assignment Help, Ask Question on Ac resistance and dc resistance, Get Answer, Expert's Help, Ac resistance and dc resistance Discussions

Write discussion on Ac resistance and dc resistance
Your posts are moderated
Related Questions
The subject of electrical measurements is such a large one that entire books have been written on the topic. Only a few basic principles will be introduced here. Practical measurem

Q. What do you understand by Analog to Digital conversion? What do you understand by A/D conversion? Give an explanation of any one of the following A/D techniques: (i) Su

Q. Show the schematic arrangement for: (a) one- dimensional addressing, and (b) two-dimensional addressing, if a 32-kbit ROM is used to provide an 8-bit output word.

Given an n-channel enhancement MOSFET having V T = 4V, K = 0.15 A/V 2 , I DQ = 0.5A, V DSQ = 10 V, and V DD = 20 V. Using the dc design approach outlined in this section, dete

what are the disadvantages of superposition theorem?

Q. Afixed-biasmethod is illustrated in Figure. Assuming ICBO to be small compared to I BQ and I CQ , find RB such that the operating point corresponds to I CQ = 14 mA, V CEQ = 7

Q. What do you mean by Most and least significant digits? The MSD (most significant digit) in a number is the digit which represents the largest part of the number. Therefore i

Q. Explain the working of LEDs OPTOELECTRONIC devices either produce light or use light in their operation. The first of these, the light-emitting diode (LED), was developed to

Convolution :   (i) Express this function in terms of kernel coefficients and convolve with image class.png, (x,y are coordinates of pixels) Io(x,y)=I(x+1,y)-2*I(x,y)+I(x-1,

Q. Explain Internal Data Bus? Internal Data Bus: A bus which operates only within internal circuitry of the CPU, communicating among internal caches of memory which are part of