6d-Electromagnetic induction Flashcards
Q: How is a voltage induced in a conductor or coil?
A: A voltage (potential difference) is induced when:
A wire or coil moves through a magnetic field.
A magnetic field changes around a conductor (e.g., moving a magnet in/out of a coil).
Q: What is this process called?
A: This process is called electromagnetic induction.
Q: What factors affect the size of the induced voltage?A:
Speed of movement (faster movement = larger voltage).
Strength of the magnetic field (stronger field = larger voltage).
Number of turns in the coil (more turns = larger voltage).
Q: How is electricity generated using electromagnetic induction?
Rotating a magnet inside a coil of wire induces a voltage.
Rotating a coil inside a magnetic field also induces a voltage.
The induced voltage causes an alternating current (AC) if the rotation continues.
Q: What factors increase the size of the induced voltage in a generator?
Faster rotation of the magnet or coil.
Stronger magnetic field.
More turns in the coil.
Larger coil area (capturing more magnetic flux).
Practical: Investigating Electromagnetic Induction
Inducing Voltage Using a Moving Magnet
Method: Move a bar magnet in and out of a coil connected to a voltmeter.
Observation: A voltage is induced when the magnet moves.
Conclusion: Faster movement increases voltage, confirming electromagnetic induction.
Practical: Investigating Electromagnetic Induction
Generating AC with a Rotating Magnet
Method: Rotate a magnet inside a coil connected to an oscilloscope.
Observation: A sinusoidal AC voltage appears on the screen.
Conclusion: A continuous changing magnetic field generates alternating voltage.
