Term
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Definition
CURRENT IS INVERSELY PROPORTIONAL TO RESISTANCE
E
I= ---
R
I= CURRENT IN AMPERES
E= VOLTAGE IN VOLTS
R= RESISTANCE IN OHMS |
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Term
| WHAT IS THE PURPOSE OF OHM'S LAW? |
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Definition
| ALLOWS YOU TO FIND THE RESISTANCE OF A CIRCUIT BY KNOWING ONLY THE VOLTAGE AND THE CURRENT OF THE CIRCUIT. |
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Term
Matter can be found in which of the following forms?
1. Solid
2. Liquid
3. Gaseous
4. Each of the above
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Definition
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Term
A substance that CANNOT be reduced to a simpler substance by chemical means is called a/an?
1. element
2. mixture
3. compound
4. solution
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Definition
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Term
A molecule is the smallest possible particle that retains the characteristic of which of the following substances?
1. An element
2. A mixture
3. A compound
4. A solution
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Definition
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Term
An atom is the smallest possible particle that retains the characteristic of which of the following substances?
1. An element
2. A mixture
3. A compound
4. A solution
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Definition
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Term
What subatomic particle has a negative charge and a small mass?
1. Proton
2. Electron
3. Positron
4. Neutron
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Definition
2. Electron (neg - )
1. Proton ( pos + ) |
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Term
What subatomic particle has a positive charge and a large mass?
1. Proton
2. Electron
3. Positron
4. Neutron
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Definition
1. Proton ( pos + )
2. Electron ( neg - ) |
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Term
What subatomic particle has no charge?
1. Proton
2. Electron
3. Positron
4. Neutron
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Definition
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Term
When light is represented as a tiny packet of energy, what are these packets of energy called?
1. Angstroms
2. Photons
3. Wavelengths
4. Frequencies
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Definition
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Term
If light energy collides with an orbiting electron, what happens to the electron?
1. The electron will move around the same orbit faster
2. The electron will jump to an orbit further from the nucleus
3. The electron will jump to an orbit closer to the nucleus
4. The electron will merge with the nucleus
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Definition
| 2. The electron will jump to an orbit further from the nucleus |
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Term
The electron will return to the condition it had before being acted upon by the light. When the electron returns to this condition, which of the following actions occurs?
1. The nucleus becomes lighter
2. The atom becomes an ion
3. Light energy is emitted
4. The valence of the atom changes
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Definition
| 3. Light energy is emitted |
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Term
The number of electrons in the outermost shell of an atom determines which of the following characteristics of the atom?
1. Valence
2. Atomic weight
3. Atomic number
4. Number of shells
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Definition
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Term
When an atom gains or loses an electron, which of the following terms applies?
1. Unbalanced
2. Lightened
3. Neutral
4. Ionized
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Definition
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Term
What is the main difference between conductors, semiconductors, and insulators?
1. The temperature differences
2. The physical state of their mass
3. The number of free electrons
4. The designations of the outer shells
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Definition
| 3. The number of free electrons |
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Term
A substance with an excess of electrons is considered to be in what electrical state?
1. Neutral
2. Positive
3. Negative
4. Discharged
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Definition
3. Negative
A body with an excess of electrons is considered to be negative, whereas a body with a deficiency of electrons is positive
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Term
Which of following actions describes the easiest way to accumulate a static electric charge?
1. Friction between two conductors
2. Friction between two insulators
3. Pressure between two conductors
4. Pressure between two insulators
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Definition
| 1. Friction between two conductors |
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Term
An atom that contains 6 protons and 5 electrons has what electrical charge?
1. Positive
2. Negative
3. Neutral
4. Intermediate
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Definition
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Term
How do "like" and "unlike" charges react to one another?
1. Unlike charges repel each other, like charges repel each other
2. Unlike charges attract each other, like charges attract each other
3. Unlike charges repel each other, like charges attract each other
4. Unlike charges attract each other, like charges repel each other
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Definition
4. Unlike charges attract each other, like charges repel each other |
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Term
What is/are the term(s) applied to the space between and around charged bodies in which their influence is felt?
1. Electric field of force
2. Electrostatic field
3. Dielectric field
4. Each of the above
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Definition
4. Each of the above
The space between and around charged bodies in which their influence is felt is called an ELECTRIC FIELD OF FORCE. It can exist in air, glass, paper, or a vacuum. ELECTROSTATIC FIELDS and DIELECTRIC FIELDS are other names used to refer to this region of force.
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Term
Electrostatic lines of force are drawn in which of the following manners?
1. Entering negative charge, entering positive charge
2. Entering negative charge, leaving positive charge
3. Leaving negative charge, leaving positive charge
4. Leaving negative charge, entering positive charge
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Definition
2. Entering negative charge, leaving positive charge
To avoid confusion, the lines of force exerted by a positive charge are always shown leaving the charge, and for a negative charge they are shown entering
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Term
Which of the following devices use magnetism?
1. Batteries
2. Light bulbs
3. High-fidelity speakers
4. Each of the above
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Definition
| 3. High-fidelity speakers |
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Term
Magnetic materials have which of the
following qualities?
1. They are attracted by magnets
2. They can be magnetized
3. Both 1 and 2 above
4. They are electrical insulators
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Definition
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Term
Ferromagnetic materials have which of the following qualities?
1. They are all alloys
2. They all contain nickel
3. They make very weak magnets
4. They are relatively easy to magnetize
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Definition
4. They are relatively easy to magnetize
Ferromagnetic materials are those which are relatively easy to magnetize, such as iron, steel, cobalt, and the alloys Alnico and Permalloy
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Term
A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet?
1. Temporary
2. Permanent
3. Residual
4. Natural
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Definition
1. Temporary
PERMEABILITY
is defined as the ease with which a material accepts magnetism. A material which is easy to magnetize does not hold its magnetism very long, and vice versa.
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Term
The ability of a material to retain magnetism is called
1. permeability
2. retentivity
3. reluctance
4. ionization
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Definition
2. retentivity
RETENTIVITY
is defined as the ability of a material to retain magnetism
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Term
Weber'
s theory of magnetism assumes that magnetic material is composed of
1. tiny molecular magnets
2. domains of magnetic influence
3. large blocks of material acting as magnets
4. atoms with electrons spinning different directions
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Definition
| 1. tiny molecular magnets |
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Term
According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counterclock-wise, the atom is considered to be
1. charged
2. insulated
3. neutralized
4. magnetized
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Definition
4. magnetized
If an atom has equal numbers of electrons spinning in opposite directions, the magnetic fields surrounding the electrons cancel one another, and the atom is unmagnetized. However, if more electrons spin in one direction than another, the atom is magnetized
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Term
Bar magnets should be stored in which of the following manners?
1. Separately
2. In pairs at 90 degree angles
3. In pairs with north poles together
4. In pairs with a north pole and a south pole together
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Definition
4. In pairs with a north pole and a south pole together |
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Term
Circuit protection devices are used for which of the following purposes?
1. To protect people
2. To protect circuits
3. To guard against hazardous conditions
4. All of the above
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Definition
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