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Electronics ETA Certification Practice
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The "triboelectric effect" causes what kind of electricity? ✔✔Static
The law of static electrical charges states: ✔✔like charges repel
Minute particles that make up all possible elements and still retain the unique chemical characteristics of the element are called _____________. ✔✔Atoms
A molecule is the smallest particle of matter that can exist by itself. (1) ✔✔True (1)
A basic atom must contain what two types of subatomic particles? ✔✔Electron and proton
An electron has _______________. ✔✔a Negative charge
What two types of energy are used throughout electronics? ✔✔Kinetic and potential
Electrical direct current flowing in a wire produces a magnetic field: ✔✔at right angles to current flow
A material is magnetized when the: ✔✔domains are in alignment
A material that can be magnetized easily falls into this category: ✔✔Ferromagnetic
Invisible lines of force that surround a magnet are called ___________________. ✔✔magnetic flux lines
The pole of a magnet from which flux leaves is called the __________________. ✔✔north
_________________ force produces magnetic flux. ✔✔Magnetomotive
What class of fire extinguisher is used on an oil fire? ✔✔B
It is dangerous to use wooden handled tools around high voltage due to their ability to absorb moisture. (2) ✔✔True (2)
Which device would most likely include a light level meter? ✔✔Camera
The most common functions of a generic multimeter are _________________________. ✔✔voltmeter, ammeter and ohmmeter
Digital multimeters eliminate which of the following disadvantages of analog meters? ✔✔• Low impedance
- Poor accuracy
- Parallax errors
The Wheatstone bridge can be used for precision measurements of: ✔✔resistance
The ammeter setting on a multimeter indicates what type of reading? ✔✔current
A resistor with color bands of blue, gray and black has a value of _______________. ✔✔ 68 ohms 20%
A/an _____________ allows current to flow easily. ✔✔conductor
A/an _________________ stops the flow of current. ✔✔insulator
A component whose value is measured in microfarads is a: ✔✔capacitor
A component whose value is measured in ohms is a: ✔✔resistor
Switches are rated in maximum ___________ and ______________. (1) ✔✔current, voltage (1)
Fuses are rated in maximum _____________ and ______________. ✔✔current, voltage
In an electrical circuit where the voltage and resistance are known, which form of Ohm's law is used to find the circuit current? ✔✔I = E/R
A unit of energy is the: ✔✔Joule
Which symbol is used for Ohms of resistance? ✔✔Omega
Which symbol means "a change of"? ✔✔Triangle
Which metric prefix would be used to represent 1 x 10^6? ✔✔Mega
Which metric prefix would be used to represent 1 x 10^-3? ✔✔Milli
Which metric prefix would be used to represent 1 x 10^12? ✔✔Tera
________________ is a term used to describe voltage. ✔✔Electromotive force
The unit of measurement for electron flow is a(n) ____________. ✔✔ampere
A term used to describe opposition to current flow is _______________. ✔✔resistance
The basic unit of electric power is the _____________. ✔✔watt
In a linear electrical circuit, voltage and current are _______________. ✔✔directly proportional
In a series circuit, the current is _________________. ✔✔the same in all parts of the circuit
Total power in a series circuit equals the __________________. ✔✔sum of the power dissipated by each resistor
The sum of voltage drops in a series circuit: ✔✔equals the applied voltage
A decrease in the current of a series circuit can be caused by a: ✔✔resistance increase
When the resistance of a series circuit decreases, ________________________. ✔✔total current increases
If a series circuit has a current of about 15.4 mA and a source voltage of 20 V, the total resistance is approximately ____________________. ✔✔1300 ohms
Kirchhoff's first law is also know as the principle of conservation of electric charge. It states that at any point, the sum of currents flowing towards that point is equal to the sum of currents flowing away from that point. ✔✔True (4)
The total current in a series-parallel circuit equals the _____________. ✔✔applied voltage divided by the total resistance
When two 10 kΩ parallel resistors are connected in series with a third 10 kΩ
resistor, total resistance (RT) is ____________. ✔✔15 kiloohms
With 70 volts applied to two 30 kΩ
resistors in series connected to three30 kΩ
resistors in parallel forming a series-parallel circuit, what is the total current? ✔✔1 mA
If a short occurs in the parallel portion of a series-parallel circuit, how will the total resistance be affected? ✔✔It will decrease
Thevenin's Theorem states that it is possible to simplify any circuit containing any amount of voltage sources, current sources or resistances, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load. (5) ✔✔True (5)
Battery cells are connected in parallel to ________________. ✔✔increase current capacity
Battery cells are connected in series to _____________________. ✔✔increase voltage output
The output of a lead-acid cell is approximately: ✔✔2.1 V
Given a battery rated at 200 ampere-hours, how many hours will the battery be able to provide 10 amperes? ✔✔ 20
