lakshmi gopireddy adventures in stem electromagnetism
TRANSCRIPT
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Lakshmi GopiReddy
Adventures in STEM
Electromagnetism
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Magnets
Magnetic field flows from North to South in almost circular fashion
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Activity 1Connect the electromagnet to the battery.▫What happens when you place a magnet at
the ends of the nail? ▫Use a compass and find the poles of the
magnet.▫What happens when you reverse the
terminal connections on the battery?
▫Can you explain how an electromagnet works?
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Electromagnets
the direction of the magnetic field if the direction of the current is known.Right hand rule: Hold your hand along the nail with the thumb up. If the curl of your fingers represent the direction of flow of current, the thumb represents the north pole.
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Generating ElectricityFaraday's Law: Electric force is generated due to a changing Magnetic -field through a conducting coil, also called principle of induction.
Moving magnet, stationary coilMoving coil, stationary magnet
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Faraday’s Law• Voltage generated
proportional to1. Number of coil turns, N
2. Strength of the magnets
3. change in magnetic field a) Speed of rotation
Approximate pull force: over 12 lbs
Approximate pull force: over 4.5 lbs
Speed= 1 rotation/secVgen= 8 volts
Speed= 2 rotation/secVgen= 16 volts
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Activity: Generate Electricity using Magnets
Step 1: Wind the wire around the cardboard box. Step 2: Remove the insulation from the two ends of the wire
on the cardboard.Step3: Connect the light bulb to the ends of the wire.Step4: Place the skewer/stick through the box and place the
magnets at the center of the box around the skewer/stick.Step5: Rotate the skewer/stick so that the magnets rotate
too. Observe the light bulb light up. Remember, faster the rotation, more the generated
electricity.
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MotorConverts electrical energy to mechanical energy.Opposite of a generator.Based on the principle of an electromagnet.
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https://dlnmh9ip6v2uc.cloudfront.net/assets/1/d/4/3/f/525d9258757b7f557c8b4567.gifhttps://learn.sparkfun.com/tutorials/motors-and-selecting-the-right-one/all