Chapter 4
Temporary magnets produced by moving electric current.
What is electromagnets?
Uses a tube-support column mounted on the floor.
What is the a floor suspension system?
The name for a positive electrode
What is an anode?
The name for a negative electrode.
What is a cathode?
The force fields that are created when magnetic dipoles orient to create a magnet.
What is a magnetic field?
A device capable of accumulating and storing an electrical charge.
What is a capacitor?
Combination of several waveforms of current slightly out of step with one another.
What is multiphase power?
Precise control of the thermionic cloud; changes charge of focusing cup from negative to positive.
What is grid-biased tubes?
Will activate the rotor and initiate the exposure.
What is an exposure switch?
The filament current that has risen to it's maximum value because all available electrons have been used.
What is saturation current?
Weakly repelled by a magnetic field.
What is diamagnetic materials?
An automatic exposure control device used to terminate the exposure after a desired exposure has been reached.
What is the ionization chamber?
The theory that due to the geometry of the angled anode target, the radiation intensity is greater on the cathode side.
What is the anode heel effect?
Two coils placed in proximity to each other, varying current supplied to the first coil, induces similar flow in second coil.
What is mutual induction?
When the voltage is decreased from the primary to the secondary.
What is step-down transformer?
A device used to convert mechanical energy into electrical energy.
What is a generator?
The net voltage produced during full-wave rectification.
What is a voltage ripple?
The principle that describes the relationship between the actual and effective focal spots in the x-ray tube.
What is the line focus principle?
Capable of producing high intensity beams in a short time.
What is rotating tubes?
The conversion of the opposing half of the incoming electron flow to always move in the same direction, instead of discarding half of the cycle.
What is full wave rectification?
The law that states the induced voltage in a coil is proportional to the product of the number of loops and the rate at which the magnetic field changes within those loops.
What is Faraday's law?
A device used in falling-load generators and some compactor units to monitor the product of mA and time on the secondary side of the high-voltage step-up transformer.
What is a milliampere-second timer?
A point when so many electrons are coming off the filament that they oppose the release of any more.
What is the space charge effect?
The parts of a generator that rotate with the armature and make contact with the brushes.
What is slip rings?
Helix coil through which current is flowing; it uses the coil loops to produce a greatly strengthened magnetic field.
What is solenoid?