electronics info

base emitter collector controller

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

0.075 milliamperes Ohm's Law states that voltage is equal to current times resistance, or, V = IR. Solve the equation for current, I, and substitute the known values, noting that 20k ohms is equivalent to 20,000 ohms: I = 1.5V/20,000ohms. This yields an answer of amperes, but the answer choices only provide milliamperes. To convert amperes to milliamperes, use the conversion factor of 1 A = 1000 mA: 0.000075A x (1000 mA/1A) = 0.075 mA. Note that the A's in the numerator and denominator cancel, leaving the desired mA; this technique is called dimensional analysis and proves extremely useful in verifying answers

Given the electrical circuit in the image provided, what is the current in resistor R1? View Image

0.16666666667 amperes

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. 32 cycles per second = 32 hertz.

A semiconductor describes elements that have ____ electrons in their valence shell.

4 Elements that have 4 electrons in their valence 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

Inductor

A coil of wire that creates a magnetic field when current passes through it

conductor

A material that allows heat and electricity to pass through it.

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

Amperes is the term for the measured rate of electrons through a conductor.

Current is measured using ____.

An ammeter

resistor

An electrical device that resists the flow of electrical current

electron shell

An energy level representing the distance of an electron from the nucleus of an atom.

Current

Current is the rate of the electron flow and is measured in amperes (amps).

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

Induction is measured in ____.

Henries

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

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

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. A PNP is just the opposite.

Symbol used for amperes

The letter "A" is an acceptable symbol used to represent amperes.

Electrical power is expressed in ____.

Watts (W)

An inductor

When the voltage increases, the inductor moves against the current, decreasing it. When the current flow decreases, the inductor makes the current keep flowin

Voltage

a measurement of electrical pressure.

galvanometer

a type of ammeter which is usually used to measure electrical current.

To measure voltage, one would use ____.

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

A series circuit would best be described as ____.

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

An inductor .

an electrical component that opposes the electrical current flow

The symbol in this image represents a ____ in an electrical circuit. View Image

battery

The farad is the unit of measurement of ____.

capacitance

A capacitor is also known as ____.

condenser

An ampere is defined as one ____ flowing past a point in one second.

coulomb

A galvanometer is usually used to measure ____.

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 When a junction of P-type and N-type material is formed, a diode is created.

The two types of electrical current are ____.

direct and alternating

Voltage is also known as ____.

electrical potential

The primary components in a bipolar junction transistor are the collector, the base and the ____.

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

Inductance

how easily a certain material will induce an electromotive force (emf) within a circuit

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

inductors

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

magnetic

Electrical resistance is best defined as ____.

opposition to the flow of current

This diagram illustrates an electrical circuit wired in ____. View Image

parallel

The largest subatomic particle with a positive charge is called the ____.

proton

The nucleus of an atom contains what two subatomic particles?

protons and neutrons

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

resistance increases

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

resistor

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

shell

The symbol in this diagram is the symbol for ____. View Image

signal ground

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 perform which of these in an electrical circuit?

store an electrical charge

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.

coulomb

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

This symbol represents what electronic circuit component?

transistor

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

transistors have no moving parts and all of their electricity exists in their material

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

valence shell

Electrical "pressure" is also known as ____.

voltage

Electromotive force is another word for ____.

volts