Group lab report Electromagnetic induction and transformers

.docx

School

Miami Dade College, Miami *

*We aren’t endorsed by this school

Course

131

Subject

Physics

Date

Jan 9, 2024

Type

docx

Pages

Uploaded by MateKoupreyPerson718

PHYSICS LABORATORY LAB REPORT – 60% OF THE LAB GRADE (Complete and save in pdf, send it by assignment in blackboard) Name (Last, First) Zahan, Ilma Segura Alvarez, Fabiola Zchesan, Leonel Title of the lab: ELECTROMAGNTETIC INDUCTION AND TRANSFORMERS. Date 06/30/2022 OBJECTIVES: (5 points) 1) Verify the Faraday-Lenz‘s Law 2) Perform measurements with a set of coils to understand how a transformer works. MATERIALS: (Complete by watching the video to the measures ) . • Galvanometer • Set of coils • Iron core • Magnets • Power supply (marked as Faraday)  Multimeter EXPERIMENTAL PROCEDURE: ( 5 points) The experiment consisted of introduce a magnet inside a coil setup to a Galvanometer. First, the professor introduced a North Magnet inside the coil, once it was inside, the Galvanometer started to read a flow current. Second, the professor removed the North Magnet and the Current changed direction to right. Third, the professor introduced a South Magnet and executed the same process to introduce and remove the magnet inside the coil. The Galvanometer read the current but, in this case, the current flowed from left to right. Change of the movement causes the current. Change in magnetic field, when it sees the coil, it responds. Red north pole, white south pole. Change of the magnetic field inside the coil, you get the current change. Change in the magnetic field. Write the equation of the magnetic flux and the name of each term (5 Points) ∅ B = B Scosθ ∅ B is the magnetic Flux B is the magnetic field intensity.

S is the area. ϴ is the angle between the vector B and normal vector to S. Area is perpendicular to the coil Write the Faraday´s law equation and the name of each term. (5 points) ∈ = − d ∅ dt where ∈ is the electromotive force (EMF) and ∅ B is the magnetic flux . EXPERIMENTAL RESULTS: DATA, CALCULATIONS, TABLES, GRAPHS PART I: Electromagnetic Induction. Watch the video. RESULT ANALYSIS 1. Describe what happened when the magnet was moved toward the coil slowly and quickly .(10 points) When the coil is moved slowly, the current goes to 0 and when it is moved quickly it goes back and forth in the current measurement. There is a direct relationship between the North and South magnet and the coil’s movement. When each magnet was moving slowly it was creating a slow current meanwhile a quick magnet’s movement created more current. 2. Why is there absence of induced electric current when the magnet remains at rest inside the coil?. .(10 points) When the magnet is at rest inside the coil, the magnetic field and flux is constant and there is no inductive voltage. There is absence of induced electric current because the magnetic flux becomes constant, hence, the induced electric current becomes zero because the derivative of a constant = 0. In previous question we described the direct relationship between the coil movement and the magnet because it based on Faraday’s Law. Again, in this question if the magnet remains at rest, it is not producing a change in the magnetic field therefore there is not an induced current in the coil.

PART II: Transformers. The experiment consisted of putting transformers connected to a primary and secondary coil onto an adjusted platform. Once they were setup in the platform the AC power generator was connected to the set of transformers and the multimeter was also connected to the coils. After everything was connected the students proceed to manipulate the current coming from the AC generator. These changes produced different coil’ lectures in the multimeter. Once all the lectures were showing in the multimeter, the students took notes on how the primary and the secondary coil changed every time there was a change of current and made a final calculations in the below tables. A transformer consists of two coils, primary and secondary coils, mounted onto an iron core. When the switch in the primary circuit is closed, the ammeter in the secondary circuit deflects momentarily. The EMF (electromotive force) in the secondary circuit is caused by the changing magnetic field through the secondary coil. TRANSFORMER A. Set two coils (Primary 200 turns and Secondary 400 turns) on to the iron core. Connect the first to the multimeter and the second to a AC power supply . (10 points) Primary voltage Secondary Voltage V s V p Primary Turns N p Secondary Turns N s N s N p 1.03 1.74 1.689 200 400 2 2.01 3.48 1.731 200 400 2 3.04 5.30 1.743 200 400 2 4.04 7.24 1.792 200 400 2 5.01 9.03 1.802 200 400 2

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version