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US_TECH_2022_2026

Technician 2022-2026 - Electrical principles and math

Electrical principles and math groups the T5 section questions for focused review and easier weak-point tracking.

52
Questions
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Technician 2022-2026
Questions
52
Topic
Electrical principles and math
Region
US
Read the condition in the stem before comparing key terms in the options.
Study rules, calculations, and equipment questions as separate patterns.
After this topic, return to the full pool for mixed practice.

Topic Study Guide

This topic covers the foundational electrical concepts required for the Technician exam, including Ohm's Law, power calculations, metric prefix conversions (milli, kilo, mega, giga), and practical applications of decibels (dB). Mastering these formulas and units is essential for understanding antennas and radio circuits later.

High-Yield Checks

  • Ohm's Law & Power Formula: Memorize E = I × R and P = I × E. The exam directly tests formula rearrangement and simple multiplication/division.
  • Metric Prefixes: Master the conversions between milli (1/1000), kilo (1,000), mega (1,000,000), and giga (1,000,000,000), paying close attention to decimal point placement.
  • Decibel (dB) Power Rules: Remember two core rules: doubling power is a 3 dB increase, and multiplying power by 10 is a 10 dB increase.
  • Basic Electrical Units: Match physical properties to their units, such as Capacitance to Farads and Inductance to Henrys.

Trap Patterns

  • Confusing Voltage and Current definitions: Voltage is the force that pushes electrons, while Current is the actual flow of electrons.
  • Decimal placement errors in conversions: For example, converting 1.5 amperes to milliamperes requires multiplying by 1,000 (1500 mA), often miscalculated as 150 mA.
  • Equating Impedance with DC resistance: Forgetting that impedance specifically refers to the opposition to alternating current (AC) flow.

Review Steps

  • Step 1: Memorize basic electrical terms (Voltage, Current, Resistance, Impedance) and their corresponding units (Volts, Amperes, Ohms).
  • Step 2: Draw the Ohm's Law (E-I-R) and Power (P-I-E) "magic triangles" on paper to practice deriving formulas like I = E/R or R = E/I.
  • Step 3: Drill conversion questions involving MHz, kHz, GHz, mW, and W to ensure accurate decimal point shifts every time.
  • Step 4: Memorize the 3dB and 10dB power multipliers to instantly solve questions like 5W to 10W or 20W to 200W.

Quick Checks

  • Can you accurately name the units for Capacitance and Inductance?
  • If you know the voltage and current, which formula do you use to calculate Power?
  • What is the dB change when power increases from 5 watts to 10 watts?
  • How many kHz is equal to 3.525 MHz?

Questions in This Topic

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T5A01Electrical current is measured in which of the following units?T5A02Electrical power is measured in which of the following units?T5A03What is the name for the flow of electrons in an electric circuit?T5A04What are the units of electrical resistance?T5A05What is the electrical term for the force that causes electron flow?T5A06What is the unit of frequency?T5A07Why are metals generally good conductors of electricity?T5A08Which of the following is a good electrical insulator?T5A09Which of the following describes alternating current?T5A10Which term describes the rate at which electrical energy is used?T5A11What type of current flow is opposed by resistance?T5A12What describes the number of times per second that an alternating current makes a complete cycle?T5B01How many milliamperes is 1.5 amperes?T5B02Which is equal to 1,500,000 hertz?T5B03Which is equal to one kilovolt?T5B04Which is equal to one microvolt?T5B05Which is equal to 500 milliwatts?T5B06Which is equal to 3000 milliamperes?T5B07Which is equal to 3.525 MHz?T5B08Which is equal to 1,000,000 picofarads?T5B09Which decibel value most closely represents a power increase from 5 watts to 10 watts?T5B10Which decibel value most closely represents a power decrease from 12 watts to 3 watts?T5B11Which decibel value represents a power increase from 20 watts to 200 watts?T5B12Which is equal to 28400 kHz?T5B13Which is equal to 2425 MHz?T5C01What describes the ability to store energy in an electric field?T5C02What is the unit of capacitance?T5C03What describes the ability to store energy in a magnetic field?T5C04What is the unit of inductance?T5C05What is the unit of impedance?T5C06What does the abbreviation “RF” mean?T5C07What is the abbreviation for megahertz?T5C08What is the formula used to calculate electrical power (P) in a DC circuit?T5C09How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?T5C10How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?T5C11How much current is required to deliver 120 watts at a voltage of 12 volts DC?T5C12What is impedance?T5C13What is the abbreviation for kilohertz?T5D01What formula is used to calculate current in a circuit?T5D02What formula is used to calculate voltage in a circuit?T5D03What formula is used to calculate resistance in a circuit?T5D04What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?T5D05What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?T5D06What is the resistance of a circuit that draws 4 amperes from a 12-volt source?T5D07What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?T5D08What is the current through a 100-ohm resistor connected across 200 volts?T5D09What is the current through a 24-ohm resistor connected across 240 volts?T5D10What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?T5D11What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?T5D12What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?T5D13In which type of circuit is DC current the same through all components?T5D14In which type of circuit is voltage the same across all components?

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