Electronics Information - ASVAB

1.5 volts sent through a 20 KΩ resistor would result in ____ of current.

0.075 miliamperes

The electron shell closest to the nucleus of an atom can hold ____ electrons.

2 The first shell can hold up to 2 electrons, the 2nd 8, the 3rd 18, the 4th 32, and the 5th and higher can hold up to 50 or more, theoretically.

32 cycles per second is equivalent to ____.

32 Hertz (Hz) Cycles per second was at one time a common unit to measure frequency but was eventually replaced by the hertz.

A semiconductor describes elements that have ____ electrons in their valance shells.

4 Elements that have 4 electrons in their valance shell are called semiconductors.

Carbon has 6 protons and 6 neutrons in its nucleus. How many electrons does it have?

6 Elements will typically carry an equal number of electrons and protons.

How many volts does it take to send 99 amps of current through 99,000 ohms of resistance?

9.801 megavolts 99 amperes * 99,000 ohms = 9,801,000 volts 1,000,000 volts= 1 megavolt, so 9,801,000/1,000,000= 9.801 megavolts

Which of these is an acceptable symbol used for amperes?

A

To measure voltage, one would use ___.

A voltmeter Voltmeters measure the electrical potential difference between two points in a circuit.

A galvanometer is usually used to measure

Current A galvanometer is a type of ammeter which is usually used to measure electrical current

Regarding the material found in a transistor, ____ is the name given to the object created by the joining of P-type and N-type material.

Diode

The two types of electrical current are ___.

Direct & Alternating The flow of electricity in alternating current reverses direction eventually while direct current always flows in the same direction.

Ohm's Law is defined as ____.

E = I*R (Volts = Current * Resistance) Ohm's Law states that Voltage is equal to the current in Amps multiplied by the Resistance in ohms.

In residential wiring, the internal grounds will be connected to an external ground, also known as ____.

Earth Ground The earth acts the largest ground reference point and is used to dispense electrical charge in order to prevent shock.

Voltage is also known as

Electrical potential

Winding wire into a coil will have what effect on the magnetic field in the wire?

It will make it stronger. Bringing the wire closer together increases the strength of the magnetic field. An electromagnetic coil brings the wires very close together in a loop around a core.

The two types of transistors are ____.

PNP and NPN An NPN transistor consists of one piece of N-type, then one piece of P-type material and then one N-type piece of material. PNP is the opposite. In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector.

The largest subatomic particle with a positive charge is the ___.

Proton The proton and positron are both positively charged subatomic particles, but the proton is larger in size.

The nucleus of an atom contains what two subatomic particles?

Proton and Neutrons The electrons is not found within the nucleus.

Given Ohm's law if voltage increases and current remains the same, then ____.

Resistance increases Given that Voltage=Current * Resistance, when voltage increases and current remains the same, resistance would also increase.

In an electrical circuit, if one wanted to reduce the current and/or divide the voltage, one would use a ____.

Resistor The addition of a resistor influences the voltage (V) and the current (I) according to Ohm's Law: V=IRV=IR, where R is the resistance of the resistor. In a series circuit, in which resistors are added tail to head along a circuit, the current across each resistor is the same, and the total resistance is the sum of the individual resistances: R=(R1+R2+...)R=(R1+R2+...). In a parallel circuit, in which resistors are aligned in parallel, and the current has multiple pathways available, the current through each resistor is only the same if the resistance of the resistors in parallel are the same. The total resistance in a parallel circuit is the reciprocal of the sum of the individual reciprocal resistances: R=(1R1+1R2+...)−1R=(1R1+1R2+...)−1.

____ is the name given to the orbit an electron resides in around an atom.

Shell Electrons occupy an orbit around an atom called an electron shell also known as its principle energy level.

Which of these elements is considered a semiconductor?

Silicon Silicon is one of the most abundant elements on Earth and is used as the primary source for silicon wafers, used to make computer electronics.

A capacitor is used to preform which of these in an electrical circuit?

Store an electrical charge A capacitor in the most basic form is two electrical conductors separated by an insulator. When a charge passes through the conductors the positive charge is stored in one conductor, and the negative in the other. This causes the charge to be temporarily stored electrostatically.

Electromotive force is another word for ____.

Volts Ohm's Law E = I * R, E = volts (electromotive force)

Electrical power is expressed in _____.

Watts Electrical power is measured in watts which are a measurement of energy conversion of one joule per second.

A capacitor is also known as

a condenser

The rate of electrons through a conductor is measured in units of

amperes

Current is measured using ___.

an ammeter An ammeter is a measuring instrument used to measure current.

A series circuit would best be described as _____.

an electrical circuit with only a single path for the electrical current.

The farad is the unit of measurement of

capacitance Capacitance is the ability for something to store an electrical charge and it is measured in farads.

An ampere is defined as one __ flowing past a point in one second?

coulomb A coulomb is the unit of electrical charge defined as the charge transported by current of one ampere A in one second.

The primary components in a bipolar junction transistors are the collector, the base and the _____.

emitter The emitter acts as the outlet for electrical charge stored in the collector of the transistor.

induction is measured in ___.

henries The henry is the name of the unit measured inductance

Components of an electrical circuit that resist a charge in the flow of current are known as ___.

inductors An inductor is an electrical component that opposes the electrical current flow. When the voltage increases, the inductor moves against the current, decreasing it. When the flow decreases, the inductor makes the current keep flowing.

When an electric current passes through a wire, a ____ field is generated around the wire.

magnetic A magnetic field is the area around the wire in which magnetic forces act as electricity travels through it.

Electrical resistance is best defined as ___.

opposition to the flow of current Electrical resistance is the opposition of passage of a current through a conductor, while conductance is its reciprocal.

Given a series circuit, a break at any point in the circuit would cause _____.

the current to stop flowing. The electricity in a series circuit only flows in a single direction and therefore a break in that circuit cause the entire circuit to cease functioning.

Transistors are known as being solid-state. This means ____.

transistors have no moving parts and all of their electricity exists in their material. Unlike vacuum tubs, relays, switches, hard drives, etc. transistors have no moving parts and store their electrical charge in a solid material, usually silicon.

The outer shell of an atom is known as the ____.

valence shell The outermost electron shell in an atom is called its valence shell.

Electrical "pressure" is also known as ___.

voltage Voltage is a measurement of electrical pressure/potential. Current is the rate of electron flow and is measured in ampere (amps). There is a direct proportional relationship between voltage and current.