Electronics Information Flashcards
The farad is a unit of measurement for
a) Capacitance
b) Voltage
c) Power
d) Current
a) Capacitance
In electrical wiring, which of the following are proportional?
a) The insulation around the wire and the amount of the voltage
b) The length of the wire and the amount of the current
c) The insulation around the wire and the amount of the current
d) The diameter of the wire and the amount of the current
d) The diameter of the wire and the amount of the current
Regarding magnets, what is a measure of the quantity of magnetism?
a) Magnetic flux
b) Reluctance
c) Permeability
d) Retentivity
a) Magnetic flux
Silver is a better conductor of electricity but copper is used more often in electrical circuits. Why?
a) Copper is cheaper than silver
b) Copper is stronger than silver
c) Copper is less likely to be stolen than silver
d) Copper has a higher melting point than silver
a) Copper is cheaper than silver
In household electrical wiring, which color of insulation indicates the “hot” wire?
a) Copper
b) Black
c) Red
d) Green
b) Black
What is the primary difference between a rectifier and an inverter?
a) A rectifier strips out the DC portion of electricity while an inverter strips out the AC portion
b) A rectifier strips out the AC portion of electricity while an inverter strips out the DC portion
c) A rectifier converts AC input to DC while an inverter converts a DC input to AC
d) A rectifier multiplies DC power while an inverter multiplies AC power
c) A rectifier converts AC input to DC while an inverter converts a DC input to AC
In metals, increasing the temperature typically _____ conductivity?
a) Does nothing to
b) Increases
c) Doubles
d) Decreases
d) Decreases
Inductance is a factor in which of the following?
a) An AC circuit
b) Batteries connected in parallel
c) Determining connected in parallel
d) Determining energy stored by a capacitor
e) A DC circuit
a) An AC circuit
Which of the following is not a common type of battery?
a) Power cell
b) Deep cycle
c) Dry cell
d) Wet cell
a) Power cell
Which of the following is not true about a line drop?
a) It’s a decrease in voltage between two points on a line
b) It’s addressed by raising voltage and lowering current across the transmission line
c) It’s addressed by raising current and lowering voltage across the transmission line
d) It’s caused due to resistance
c) It’s addressed by raising current and lowering voltage across the transmission line
This is the circuit symbol for a ____
a) AC power supply
b) Transistor
c) Lamp
d) Resistor
d) Resistor
Which of these materials is not a good conductor of electricity?
a) Marble
b) Water
c) Bronze
d) Silver
a) Marble
Why is an insulator a poor conductor of electricity?
a) An insulator is made of organic material
b) An insulator has a crystalline structure
c) An insulator has a matrix structure
d) An insulator has few free electrons
d) An insulator has few free electrons
How would you connect 8 [6v 25A] batteries to achieve a combined power output of 6V 200A?
a) Parallel
b) Parallel-series
c) Series parallel
d) Series
a) Parallel
Use Ohm’s Law to calculate the value of voltage in this circuit if resistance = 30 ohms and current = 1.67 amps.
a) 25 volts
b) 17.96 volts
c) 50 volts
d) 100 volts
c) 50 volts
This is the circuit symbol for a ___
e) Transformer
f) Potentiometer
g) Ground
h) Rheostat
g) Ground
Which of the following is a characteristic of a conductor?
a) An example is an organic like cotton
b) An example is a metal like copper
c) Few free electrons
d) Low conductivity
b) An example is a metal like copper
Which of the following statements about a capacitor is false?
a) You should always discharge any capacitors before working on an electronic circuit
b) To discharge a capacitor safely, use a high wattage resistor comparable to the capacitance of the capacitor
c) It’s safe to touch a capacitor with your hands as long as it’s small
d) A capacitor remains charged even after the input voltage is removed
c) It’s safe to touch a capacitor with your hands as long as it’s small
This is the circuit symbol for a ____.
a) Transformer
b) Connected wires
c) Ground
d) Potentiometer
b) Connected wires
Which of the following is the preferred method for splicing wires?
a) Screw on connectors
b) Wrap in small gauge wire
c) Wire cutter
d) Soldering
d) Soldering
From what do photovoltaic cells produce their electrical energy?
a) Sun energy
b) Combustion energy
c) Chemical energy
d) Fusion energy
a) Sun energy
This is the circuit symbol for a ____
a) Potentiometer
b) Diode
c) Battery
d) Unconnected wires
a) Potentiometer
Which of these materials is not a good conductor of electricity?
a) Air
b) Carbon
c) Water
d) Bronze
a) Air
What is the frequency of most household electrical systems?
a) 60Hz
b) 220V
c) 220Hz
d) 60MHz
a) 60Hz
Which of the following is not a characteristic of batteries connected in parallel?
a) The positive terminal of one battery is connected to the positive terminal of the next
b) Two connections are made between each adjacent battery
c) One connection is made between each adjacent battery
d) Total current equals the sum of the individual battery currents
c) One connection is made between each adjacent battery
A rheostat is an adjustable
a) Voltmeter
b) Transistor
c) Resistor
d) AC power supply
c) Resistor
You would measure the amount of current through a circuit with a/an
a) Voltmeter
b) Ammeter
c) Battery
d) Ohmmeter
b) Ammeter
The diameter of a number 12 wire is ____ the diameter of a number 6 wire?
a) Less than
b) Twice
c) More than
d) Triple
a) Less than
What subatomic particle is responsible for electricity?
a) Volt
b) Ampere
c) Electron
d) Proton
c) Electron
The ohm is a unit of measurement for
a) Energy
b) Resistance
c) Frequency
d) Voltage
b) Resistance
This is the circuit symbol for a _____
a) Lamp
b) Transistor
c) Connected wires
d) Potentiometer
a) Lamp
In a closed electrical circuit current flows from
a) Low to high amps
b) High to low resistance
c) Positive to negative potentials
d) Negative to positive potentials
c) Positive to negative potentials
What is the voltage of most household electrical systems?
a) 60Hz
b) 60V
c) 220Hz
d) 110V
d) 110V
A rectifier
a) Is used to multiply the voltage in a circuit
b) Is another name for a variable resistor
c) Converts AC current to DC current
d) Converts DC current to AC current
c) Converts AC current to DC current
A capacitor to an electronic circuit is like a ____ to a house?
a) Driveway
b) Storage shed
c) Yard
d) Safe
b) Storage shed
A transistor to an electronic circuit is like a ____ to a house?
a) Driveway
b) Gate
c) Safe
d) Fence
b) Gate
Which of the following is a characteristic of direct current (DC)?
a) An example power source is a generator
b) An example power source is a battery
c) High voltage can produce low current
d) Electron flow periodically reverses direction
b) An example power source is a battery
Which of the following is not a purpose of a resistor in an electrical circuit?
a) Randomize the current in the circuit
b) Moderate the heat in the circuit
c) Control the voltage in the circuit
d) Limit the current in the circuit
a) Randomize the current in the circuit
What device is used to convert DC current to AC current?
a) Transformer
b) Regulator
c) Power inverter
d) Capacitor
c) Power inverter
How would you connect 4 [15V 25A] batteries to achieve a combined power output of 60V 25A?
a) Series parallel
b) Parallel series
c) Parallel
d) Series
d) Series
Which of the following statements about electrical resistance is false?
a) The more resistive the conductor is the faster electron flow will be
b) The more resistive the conductor is the slower electron flow will be
c) The less resistive the conductor is the faster electron flow will be
d) All materials have some resistive properties
a) The more resistive the conductor is the faster electron flow will be
What is the potential difference in an electrical circuit a measure of?
a) The load at a specific location in the circuit
b) The current at a specific location in the circuit
c) The resistance location in the circuit
d) The voltage at a specific location in the circuit
d) The voltage at a specific location in the circuit
Which of the following is the correct formula for Ohm’s Law?
a) V= R^2I
b) V= I x R
c) V= I/R
d) V= sqrt(RI)
b) V= I x R
Regarding magnets, what is the opposition that a substance offers to magnetic lines?
a) Permeability
b) Reluctance
c) Magnetic flux
d) Retentivity
b) Reluctance
An engineer who wants to document an electric circuit would create which of the following?
a) A schematic
b) A grid
c) A matrix
d) A diagram
a) A schematic
Which of the following is not a terminal on a transistor?
a) Emitter
b) Base
c) Collector
d) Input
d) Input
Capacitors connected in series produce _____ capacitance compared to capacitors connected in parallel.
a) Double
b) More
c) The same
d) Less
d) Less
This is the circuit symbol for a ______
a) Connected wires
b) Capacitor
c) Transistor
d) Battery
d) Battery
Suppose you have 10[12V 15A] batteries that you can connect together in series, in parallel, or in series-parallel. Which of the following voltage and ampere combinations cannot be attained using these 10 batteries?
a) 60V 300A
b) 60V 75A
c) 120V 75A
d) 12V 150A
a) 60V 300A
In an electronic circuit, a thermocouple is used to”
a) Provide an emergency ‘off’ switch for the circuit
b) Increase or decrease the temperature of a component in the circuit
c) Connect the circuit to ground
d) Open or close a circuit at a designated temperature
d) Open or close a circuit at a designated temperature
You would measure the amount of resistance at a certain point in a circuit with a/an
a) Thermometer
b) Battery
c) Voltmeter
d) Ohmmeter
d) Ohmmeter
Electricity cannot flow …
a) Through a circuit with resistance
b) Through a closed circuit
c) Through a circuit under load
d) Through an open circuit
d) Through an open circuit
Regarding magnet, what is the degree to which a substance remains magnetized after the magnetizing force is removed?
a) Magnetic flux
b) Permeability
c) Reluctance
d) Retentivity
d) Retentivity
Current in an electric circuit creates heat because:
a) Heat is created when the current overcomes resistance in the wire
b) Current is naturally hot
c) Voltage is naturally hot
d) Heat is created when the current overcomes voltage in the wire
a) Heat is created when the current overcomes resistance in the wire
This is the circuit symbol for a ______
a) Connected wires
b) Diode
c) Potentionmeter
d) Switch
b) Diode
Electromotive force is another name for:
a) Ac current
b) Resistance
c) Voltage
d) Heat
c) Voltage
Which of the following is not an advantage of semiconductors over conductors?
a) Materials to produce semiconductors are cheap and abundant
b) A semiconductor exhibits increased conductivity with increased temperatures
c) A semiconductor’s conductivity can be varied under an external electrical field
d) A semiconductor conducts current better than a conductor
d) A semiconductor conducts current better than a conductor
