Electronics information Flashcards by ROXOR WATANABE

What does the abbreviation DC stand for?
A. Duplicate charge
B. Direct charge
C. Direct current
D. Diode current

C. Direct Current

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Which of the following is the ohm symbol
A. Σ
B. λ
C. ⌀
D. Ω

D. Ω

upsidedown horseshoe is ohm

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Which of the following has the least resistance?
A. Iron
B. Rubber
C. Copper
D. Wood

C. Copper

used in most computers too!

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5.What increases or Decreases the voltage in a system without the need for an electrical connection?
A. Terminal
B. Trigger
C. Transmitter
D. Transformer

B. Trigger

initiates a circuits action

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A Device used to amplify a signal is called a
A. Diode
B. Transformer
C. Rectifier
D. Transistor

D. Transistor

Diode one direction
Transformer changes voltage
Rectifier makes ac to dc

act as an electronic switch or amplifier, controlling the flow of electrical current or voltage based on a small input signal

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What process changes incoming alternation current (AC) to direct current (DC)?
A. Magnetic effect
B. Rectification
C. Transformation
D. Impedance

B. Rectification

Changes to AC to DC

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The amount of electrical power is measured in units called
A. volts
B. amperes
C. watts
D. ohms

C. Watts

Measures amount of power, the rate at which energy is produced or used

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Components designed to store electrical charge are called

A. capacitors.
B. transformers.
C. resistors.
D. transistors.

A. Capacitors

Stores electric charge

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In what direction does current go in electron flow notation?

A. from negative to positive
B. from positive to negative
C. any direction
D. horizontally

A. From negative to positive

Negative electrons always searching for positive charges

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In an electronic circuit diagram, the symbol used to show wires connecting is a/an

A. X symbol
B. dot
C. dark square
D. T symbol

B. Dot

Wires connected to each other are indicated by a darkend circle

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What occurs when a wire is wrapped around an iron core and a current is sent through the wire?

A. chemical effect
B. heat effect
C. magnetic effect
D. physiological

C. Magnetic Effect

The iron becomes magnetized

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What is the term for magnetic effects that are perpendicular to the conductor and parallel to each other?
A. North pole
B. Semiconductor
C. Lines of force
D. Electroplating

C. Lines of force

magnetic lines of force are eprpendicular to the conductor and parallel

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What is commonly used in a circuit in which the flow of electricity needs to be regulated for the device to run properly?
A. Resistance
B. Transformer
C. Diodes
D. Batteries

A. Resistance

in a circuit to regulate electricity so device isnt destroyed by heat

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What color wire form the following choices is NOT considered to be a “Hot” wire?
A. Red
B. Black
C. Gray
D. Blue

C. Gray

Gray wired is neutral and grounded to earth, other colors are hot

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To measure electrical power, you would use a:
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter

D. Wattmeter

designed to measure power,often measurements of both voltage and current

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Which of the following has least resistance?
A. Iron
B. Rubber
C. Copper
D. Wood

C. Copper

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Changing AC to DC is called what?
A. Capacitance
B. Impedance
C. Rectification
D. Induction

C. Rectification

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A number 12 wire compared to a number 6 wire is:
A. Is longer
B. Is shorter
C. Is smaller in diameter
D. In larger in diameter

C. Is smaller in diameter

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If 2 volts of battery power is used to a power a flashlight that draws 1 amp of current, how much power does the flashlight use?
A. .5W
B. 2W
C. 4W
D. 16W

B. 2W
Wattage formula: P(w)=I(a) x V(v)

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How many paths of electrical flow can be found in a series circuit?
A. One
B. Two
C. Two or more
D. It can’t be determined

A. One

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The ground wire is always
A. Green
B. Black.
C. White
D. Blue

A. Green

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Silver is a better conductor than copper. But copper is more often used because of:
A. Cost of silver
B. Brittleness of copper
C. Low melting point of silver
D. Tendency of silver to tarnish

A. Cost of silver

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If a circuit has 9-Volt battery and a 3-Ohm resistor, What is the power output of the battery?
A. 27 watts
B. 243 watts
C. 81 watts
D. 6 watts

A. 27 Watts
(Ohms law and wattage formula)

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Which of the following is NOT an Ohm’s Law formula?
A V = I x R
B. I = V / R
C. R = V / I
D. I= V X R

D. I=V x R

You can’t multiply voltage and resistance
Only divide V and R = I

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A switch starts or stops the flow of electric current in a circuit by means of its: A. Probes B. Contacts C. Resistors D. insulators

B. Contacts | When a light switch is on "Off" position bar removes contact on conact p

What tool is used to remove a module from an electronic assembly? A. Chip Puller B. wire gauge C. Wire stripper D. Hydrometer

A. Chip Puller

Which of these is an example of an electrostatic discharge? A. A lightning bolt strikes a tall building B. A battery stops producing electricity C. An outdoor porch light is turned off D. A math is struck against a rock

A. A lightning bolt strikes a tall building D is an chemical reaction, C is disconnected B internal composition ## Footnote D is an chemical reaction, C is disconnected B internal composition

Ohm's law states that V= I x R. If V stays the same, then an increase in R would cause I to: A. Increase B. Decrease. C. Not change D. Not enough information

B. Decrease | V= I x R ——> I= V/R (V= 1) I stays the same (R= 2) R increases (I ) I wo ## Footnote I= AMPS R= OHMS

The color stripes on resistor indicate the resistor's: A. Volts B. Value C. Watts D. Current

B. Value | Each color band represents resistance value and tolerace

The capacity of a household electric circuit is commonly measured in units that describe its ability to deliver: A. Current B. Voltage C Resistance D Watts

A. Current | Current is measured in amps, Voltage is measured in volts, Resistance i

A circuit breaker is a type of electrical: A. Ground B. Transformer C. Switch D. Resister

C. Switch | Can be switched on, off, or tripped

When an outlet that draws more amps than it is rated to handle: A There is no risk of fire B. The outlet closes the circuit C. The outlet turns off the power D. The breaker for the circuit trips

D. The breaker for the circuit trips

If an extension cored has a smaller gauge than it is required by the appliance, it: A. May heat up and cause fire B. Will have no effect B. Shut itself off D. Not let the appliance turn on.

A. May heat up and cause fire

When an outlet is ground, it is connected to: A. An appliance B. A cold wire C. A red wire D. The earth

D. The earth | Ground rods

How much current is in the circuit? 50V 10ohms A. 3 Amps B. 5 Amps C. 2 Amps D. 10 Volts

B. 5Amps | V= I x R V= 50v, R= 10ohms 50V=10I ( I=5) ## Footnote V= Voltage I= Ohms Find R or Amps Use V= I x R

Current is measured in which of the following units? A. Volts B. Amps C. Ohms D. Watts

B. Amps | V= Volts I = Current (in amps) R= Resistance ( in Ohms)

If 220 volt series circuit has a current on 5 amps, how much resistance is in the circuit? A 22 Ohms B 25 ohms C. 44 ohms D. 50 ohms

220= 5R R= 44 C. 44 ohms | V= Volts R= Current (Amps) I= Resistance (Ohms)

If a 110 volt series circuit has a current of 10 amps, how much resistance is in the circuit? A. 8 ohms B. 9 ohms C. 10 ohms D. 11 ohms

110=10R 11=R D. 11

Which device lowers current flow in a circuit? A. Capacitor B. Transformer C. Resistor D. Diode

C. Resistor | A resistor reduces a current flow in a circuit

Which device limits current flow to a single direction? A. Capacitor B. Transformer C. Resistor D. Diode

D. Diode | Functions to allow an electric current to "flow in one direction"

Semiconductors that convert electrical current into light are: A. CFL B. LED C. Fluorescent D. Incandescent

B. LED | D has a tungsten filament, A nad B have gases to creat light

When current flow is interrupted by a blown fuse, the circuit becomes: A. Open B. Closed C. Parallel D. Shorted

A. Open | The purpose of a fuse is to keep current to flow, and prevent damage

Silicon chips are used primarily in: A. Relays B. Integrated circuits C. Motors D. Transformers

B. Integrated circuits | Similar to processors in motherboards

A standard multimeter does NOT measure A. Voltage B. Current C. Frequency D. Resistance

C. Frequency

To make permanent electronic connections use a : A. Soldering Iron B. Multimeter B. Splice connector D. Electrical Tape

A. Soldering Iron

In order to make an electric current flow, it is necessary to have: A Copper Conductors B A Ammeter C. Difference of potential D. Open circuit

C. Difference of potential | Needs to be be closed

The part that revolves in the motor of a generator is called the: A shaft B. Brush assembly C. Armature D. Bearing

C. Armature | Converts energy from electrical to mechanical, using electromagnetic

A variable resistor is commonly used to: A. Prevent a circuit overload B. Start an automobile engine C. Adjust the volume of the radio D. Turn a heater to a specific temperature

C. Adjust the volume of the radio

If you need to ensure that current was flowing in one direction only, you would use: A Transformer B Relay C Diode D Fuse

C Diode | Makes current flow in one direction

12 gauge wire is _____ than 16 gauge wire A Thicker B Thinner C Longer D More conductive

A Thicker | The higher the gauge = thinner The lower the gauge = thicker

Which of the following sizes of the air conditioning units the largest one that can be used in a 220v circuit protected by a 20 Amp circuit breaker? A 5500 Watts B 3300 Watts C 3900 Watts D 4400 Watts

W=VxA W= 220 x 20 D 4400 Watts | W= Watts V= Volts A= Amps W=VxA W= 220 x 20W=VxA W= 220 x 20

If a 30 watt light bulb is operated at 120 volts, how much current does it draw? A 0.25 amps B 2.5 amps C 25 Amp D. 3600 Amps

P= I x V 30=120I I= .25 A=.25 amps

If a computer uses 300W of power and operates for 10 hours, how many kilowatt hours of energy does it consume? A 3 kWh B 30 kWh C 300 kWh D 0.3 kWh

1000W= 1KW 300X10h= 3000 3000/ 1000W= 3kWh A. 3kWh

In a series circuit, a switch controls: A No devices on the circuit B One device on a circuit C Two devices on a circuit D All devices on a circuit

D All devices on a circuit

In which kind of circuit is current always the same at all points? A Parallel B Series C Integrated D Open

B Series | Series = flows though all loads the same Parallel= combines form the net

Rapid and interrupted current that changed direction 60 times per second is known as: A direct current B nonconductor current C alternating current D erratic current

C alternating current | AC periodically changes direction DC flows one dirrection

Which of these devices contains an electromagnet? A Light bulb B Battery C Flashlight D Doorbell

D Doorbell | powered through wires

A battery makes what kind of current? A indirect B alternating C direct D pulsing

C direct | can not be turned on or off. only on

How many 3 way switches would you use to control a hallway light from both ends of the hallway? A 1 B 2 C 3 D 4

B 2 | Needs one in each hallway, 2

Home outlets are connect to a panel box with separate circuits. The outlets are connected in: A Series B Parallel C Polarity D Combination

B Parallel | Most homes use parallel, if series all lights will be out.

Which of the following converts light energy into electrical energy A Radio B Radar C Stereo Speaker D Photoelectric cell

D Photoelectric cell | ( on a calculator)

Current that changed its polarity many times per second is: A Direct B Reciprocating C Alternating D Transitory

C Alternating | (AC) can be turned on and off

When graphed over time, household alternating current (AC) takes on distinct shape called a A sine wave B pulse wave C sawtooth wave D triangular wave

A sine wave

What is an amplifier? A a device that makes audios signals stronger B a device that increases signal strength C a device that increases amperage D a device that improves sound fidelity

B a device that increases signal strength | takes weak input and turns into high input

Which of the following best carries electric current? A Transformer B Conductor C Switches D Resistors

B Conductor | Think of wires, D) reduces flow A) changes voltage C) turns on and off

When measuring resistance with a ohmmeter you should A Connect power B Insulate probes C Disconnect power D Measure polarity

C Disconnect power | If its on it will lead to inaccurate readings

The property of a circuit that opposes the flow of electron is A Reactance B Capacitance C Resistance D Inductance

C Resistance | Opposes flow of electrons

Which of the following cant be used to store an electrical charge? A Fuse B Dielectric C Capacitor D Battery

A Fuse | Battery store charges, B is inside C which store charges

Another name for a transistor is A Integrated circuit B Semiconductor C Transfer resistor D Connector

B Semiconductor | Used to amplify, controlling, and generating electrical signals

When wire conductor are coated with solder, the process is called A Brazing B Merging C fusing D Tinning

D Tinning

A neon bulb emits light because A The current flows through neon gas B the glass is blue C the gas is blue D the filament in bulb gets hot

A The current flows through neon gas

What is the type of resistance in an AC transmitter circuit? A static B impedance C frequency D Capacitance

B impedance Static is a form of electrcity | total opposition to the flow of alternating current

What does AC stand for? A Direct current B Amplitude correction C Single flow D alternating current

D alternating current | AC/DC

Power lines carry what type of current A Alternating B Direct C transforming D limited

A Alternating

In what kind of circuit does electrical current flow from one component directly to the next component? A open B parallel C series D sequential

C series | Series flows from one component to the other Parallel flows at the same

# review symbols or parallel formulas

Electronics information Flashcards

(76 cards)