Igcse Magnetism and Electromagnetism Concepts and Definitions

Topics: Magnetic field, Electromagnetism, Electromagnet Pages: 2 (265 words) Published: March 10, 2013
IGCSE MAGNETISM AND ELECTROMAGNETISM
DEFINITIONS AND CONCEPTS

HARD AND SOFT MAGNETIC MATERIALS: Materials, which are difficult to magnetise and de-magnetise. Soft materials are easy to magnetise and de-magnetise.

MAGNETIC FIELD: The area around a magnet where another magnet would feel a force.

MAGNETIC FIELD LINES: Show the direction of the magnetic field. The lines run from North to South. Where the field is strong, they are close together.

INDUCED MAGNETISM: A magnetic material can be magnetised by being placed in a magnetic field.

ELECTROMAGNET: A current-carrying coil of wire (SOLENOID) often wrapped around a soft magnetic core which produces a magnetic field quite like a bar magnet with uniform field lines inside.

MOTOR EFFECT: A current-carrying wire in a magnetic field experiences a force. This effect is applied in simple DC motors, loudspeakers and ammeters. The force is greater when the field or current are greater.

LEFT HAND (MOTOR) RULE: With the First finger, second finger and Thumb at right angles to each other, we can model respectively Field, Current and Thrust (Motion) on a conductor.

ELECTROMAGNETIC INDUCTION: A changing magnetic field through a conductor will induce a voltage in the conductor. The voltage is greater when the change is greater (larger field or faster movement).

GENERATOR/ DYNAMO: A device, which induces a voltage when a magnet rotates in a coil or vice versa. A larger voltage is induced when the rotation is faster, the field greater or there are more turns in the coil.

TRANSFORMER: A device, which allows an input AC voltage to be stepped up or down.
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Fundamental Physics Concepts: Magnetism Essay
  • Electromagnetism Essay
  • Essay on Ib Physics Definitions and Concepts
  • Business Concept Definitions Essay
  • Essay about Macroeconomics
  • The Definition of Self-Concept Essay
  • Definition Of The Concept Of Essay
  • definition of basic concepts of sociology Essay

Become a StudyMode Member

Sign Up - It's Free