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ELECTRONICS ETA CERTIFICATION PRACTICE
EXAM CORE CIRCUITS, COMPONENTS, AND
ELECTRICAL THEORY REVIEW 2026
โ Electrical direct current flowing in a wire produces a magnetic field: Answer: at right angles to current flow โ A material is magnetized when the: Answer: domains are in alignment โ A material that can be magnetized easily falls into this category: Answer: Ferromagnetic โ Invisible lines of force that surround a magnet are called ___________________. Answer: magnetic flux lines โ The pole of a magnet from which flux leaves is called the __________________. Answer: north
โ _________________ force produces magnetic flux. Answer: Magnetomotive โ What class of fire extinguisher is used on an oil fire? Answer: B โ It is dangerous to use wooden handled tools around high voltage due to their ability to absorb moisture. (2) Answer: True (2) โ In order to eliminate possible fire hazards, rags should be stored in ________________ Answer: metal containers โ When an individual receives an electrical shock, an immediate symptom can be _______________. Answer: Cardiac arrest โ What happens as protective eye goggles age? Answer: Their resistance to scratching decreases โ Safety precautions to be followed when working on high-voltage equipment include which of the following?
- Parallax errors โ The Wheatstone bridge can be used for precision measurements of: Answer: resistance โ The ammeter setting on a multimeter indicates what type of reading? Answer: current โ A resistor with color bands of blue, gray and black has a value of _______________. Answer: 68 ohms 20% โ A/an _____________ allows current to flow easily. Answer: conductor โ A/an _________________ stops the flow of current. Answer: insulator โ A component whose value is measured in microfarads is a: Answer: capacitor
โ A component whose value is measured in ohms is a: Answer: resistor โ Switches are rated in maximum ___________ and ______________. (1) Answer: current, voltage (1) โ Fuses are rated in maximum _____________ and ______________. Answer: current, voltage โ In an electrical circuit where the voltage and resistance are known, which form of Ohm's law is used to find the circuit current? Answer: I = E/R โ A unit of energy is the: Answer: Joule โ Which of the following is commonly used to measure electrical energy consumption? Answer: Kilowatt-Hours
โ Which symbol is used for Ohms of resistance? Answer: Omega โ Which symbol means "a change of"? Answer: Triangle โ Which metric prefix would be used to represent 1 x 10^6? Answer: Mega โ Which metric prefix would be used to represent 1 x 10^-3? Answer: Milli โ Which metric prefix would be used to represent 1 x 10^12? Answer: Tera โ ________________ is a term used to describe voltage. Answer: Electromotive force โ The unit of measurement for electron flow is a(n) ____________. Answer: ampere
โ A term used to describe opposition to current flow is _______________. Answer: resistance โ The basic unit of electric power is the _____________. Answer: watt โ In a linear electrical circuit, voltage and current are _______________. Answer: directly proportional โ In a series circuit, the current is _________________. Answer: the same in all parts of the circuit โ Total power in a series circuit equals the __________________. Answer: sum of the power dissipated by each resistor โ The sum of voltage drops in a series circuit: Answer: equals the applied voltage โ A decrease in the current of a series circuit can be caused by a: Answer: resistance increase
โ In a simple parallel circuit, the voltage across each branch is ________________. Answer: equal to the source voltage โ With three 4.5 kฮฉ resistors and one 1.5 kฮฉ resistor in parallel, the total resistance is __________. Answer: 750 ohms โ 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. Answer: True (4) โ The total current in a series-parallel circuit equals the _____________. Answer: applied voltage divided by the total resistance โ When two 10 kฮฉ parallel resistors are connected in series with a third 10 kฮฉ resistor, total resistance (RT) is ____________. Answer: 15 kiloohms
โ With 70 volts applied to two 30 kฮฉ resistors in series connected to three30 kฮฉ resistors in parallel forming a series-parallel circuit, what is the total current? Answer: 1 mA โ If a short occurs in the parallel portion of a series-parallel circuit, how will the total resistance be affected? Answer: It will decrease โ 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) Answer: True (5) โ Battery cells are connected in parallel to ________________. Answer: increase current capacity โ Battery cells are connected in series to _____________________. Answer: increase voltage output
