EEE224_Fall10_Lecture1

# Examples voltage current energy temperature electric

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Examples : voltage, current, energy, temperature, electric potential, population, time, mass, distance. A vector is a quantity which has both a magnitude and a direction. Examples : velocity, momentum, acceleration, force, electric and magnetic field intensities. A a A A ˆ = G A A = G ˆ A A a A = G G Magnitude of the vector A G Unit vector in the direction of A G A G ˆ A a A A = G

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24 Scalar & Vector Fields A field is a distribution of a quantity in space. It can be either scalar or vector in nature. If the quantity is scalar Æ the field is a scalar field. Examples : temperature distribution in a room, sound intensity in a theater. If the quantity is a vector Æ the field is a vector field . Examples : the gravitional force on a body in space, the velocity of raindrops in the atmosphere.
25 Scalar Fields Temperature: Every location has an associated value (number with units) Nighttime temperature map for Mars Temperature map for Turkey (annual average temperatures)

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26 Vector Fields Falling Snowflakes Velocity vectors (both magnitude and direction)
27 Vector Fields Physical Examples Fluid flow field (Fluid is represented by a finite number of particles.) The vector velocities of the particles as seen from above are directed counterclockwise about the center of the cone A circulating flow of particles

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28 Vector Fields Physical Examples Gravitational Field The gravitational field points toward to the center of the Earth.
29 Vector Fields Physical Examples Magnetic Field of a bar magnet compass The needle aligns itself along the direction of magnetic field. The Earth’s magnetic field behaves as if there were a bar magnet in it.

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• Spring '10
• alexander
• Electromagnet, Magnetic Field, Magnetic flux density Magnetic Magnetic field, CHARGE Electromagnetics

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