Fichas
Electromagnetism (Mod. 4 Sect. 1 Part 2)
Fichas del conjunto (14)
- 1________ is the magnetic effect produced when electric current flows through a conductor.Electromagnetism
- 2The field around a current-carrying conductor consists of magnetic rings, sometimes called _____.whorls
- 3When conventional (positive to negative) current flows through a conductor, the direction of the lines of force around the conductor is _______.clockwise
- 4__________ - Imagine that you're holding a current-carrying conductor in your right hand with your thumb facing in the direction of conventional current flow. The curled fingers of your R hand now point in the direction of the lines of force, or magnetic field, surrounding the conductor.Right-Hand Rule
- 5When current flows in the same direction through two parallel wires, the wires _____ each other. When current flows the opposite direction, they _____ each other.attract, repel
- 6If a piece of insulated wire is formed into a coil, it's called a _____ coil, or a _____. When current is applied to the coil, the lines of force around each coil combine to form a larger & stronger field around the entire coil, and form N and S poles.magnetic, solenoid
- 7An ______ is made by inserting a piece of magnetic material (usually iron or soft steel) into a magnetic coil.electromagnet
- 8In an electromagnet, the material around which the conductor is coiled is called the ____.core
- 9The 3 main factors that affect the strength of the magnetic field surrounding an electromagnet are: the number of ____ in a coil, the _____ of the current, and the core's _____.turns, strength, material
- 10An electromagnetic ____ is a device that operates one or more switches or contact sets when current flows through its coil.relay
- 11A relay's main parts are an ________ and an _____.electromagnet, armature
- 12In a relay, the electromagnet is part of the _____ circuit, and the switching system (contacts) are part of the ______ circuit.control, controlled
- 13A _____ is a device made of a coil of wire, housing, and a moveable plunger. When current is applied, a mag. field forms around the coil and draws the plunger into the coil. When current flow stops, a spring above the plunger pushes it back into its original position.solenoid
- 14DC motors are used in special control systems called ____ systems. These systems use feedback devices that allow a controller to precisely position the motor's shaft and control the speed of the motor.servo
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