have the E-shaped core. At Note: Other configurations can be investigated once y
ID: 2032858 • Letter: H
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have the E-shaped core. At Note: Other configurations can be investigated once you your instructor's direc coioon, invesigate other methods of arranging the primary and sec- 8. If there are more than one PASCO Coils Sets in the laboratory, set up a series of transformers Measure input and output voltages, input and such as the one diagrammed below in Figure 4. output currents at various places in the chain. Keep careful track of your measurements and draft your observations based on these measurements. Input PrimarySecondary Primary Secondary Figure 4 Analysis raneformer basics IL 1. Calculate the quantities asked for in Table 2.2. Note the suggestion at the bottom of the page. If you were able to carry out the modification in step 7, a separate data table should be 2. What relationship exists between the output current and the input current for different coils given a constant load resi current/input current relationship for a given combination of coils? Is the effect the same for all combinations? Elaborate and make an educated hypothesis on why your experiment behaved the way it did. e? How does varying the stanc resistance change the output The ideal voltage gain is equal to the number of turns in the secondary divided by the number of tuns in the primary. How did the actual voltage gain (Vout/Vin)compare to the idcal? 3. 4 Ideally, transformers convert alternating current from one voltage to power loss (almost 100% efficient). Looking at your power gain transformers do compared to ideal transformers? convert alternating current from one voltage to another with very little Pout Pin, how did your 5. What combination of voltage and current is gained by having few coils of wire in the secon- dary? (step 6) Analyze the behavior of the coils in the E-shaped core, and compare this to the U-shaped core. Is there a distinct advantage of one over the other? Why? Can an advantage gained be further enhanced by other changes? What might they be? (step 7) 7 If you began and ended with the same number of turns in your coils (step 8), how did the input and output voltages compare? How did the input and output power for the total combi- nation compare? Were principles you experimented with previously in evidence during this part of the lab?Explanation / Answer
In a transformer with E core, the center leg (one of three legs) is twice the width of either outer leg. In theory, magnetic flux flowing out of the center leg divides equally and flows into the outer two E core legs. Since the outer legs handle half the flux they only need to have half the cross-section. An E core structure constitutes a “shell” type core structure
In contrast, a U structure (which has two core legs) only occupies one side of a coil placed over one of its legs. The E core structure provides better self-shielding than the “U” core structure .
E type cores are easily gapped than U shaped core
Since E shaped cores have two open coil sides, they provide substantial room to bring high current lead wires out from the coil. This also permits good heat dissipation .
In contrast, the standard U core has a much more restricted space in which to bring out lead wires and restricts heat flow. It is easier to achieve high voltage electrical isolation with an E shaped core than with a simple U shaped core
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