# Technician Class License Exam Questions

### Subelement T5

Electrical principles: math for electronics; electronic principles; Ohm's Law

Question Display Options:
Group T5A Electrical principles, units, and terms: current and voltage; conductors and insulators; alternating and direct current
T5A01 Electrical current is measured in which of the following units?
T5A02 Electrical power is measured in which of the following units?
T5A03 What is the name for the flow of electrons in an electric circuit?
T5A04 What is the name for a current that flows only in one direction?
T5A06 How much voltage does a mobile transceiver usually require?
T5A07 Which of the following is a good electrical conductor?
T5A08 Which of the following is a good electrical insulator?
T5A09 What is the name for a current that reverses direction on a regular basis?
T5A10 Which term describes the rate at which electrical energy is used?
T5A11 What is the basic unit of electromotive force?
T5A12 What term describes the number of times per second that an alternating current reverses direction?
Group T5B Math for electronics: conversion of electrical units; decibels; the metric system
T5B01 How many milliamperes is 1.5 amperes?
T5B02 What is another way to specify a radio signal frequency of 1,500,000 hertz?
T5B03 How many volts are equal to one kilovolt?
T5B04 How many volts are equal to one microvolt?
T5B05 Which of the following is equivalent to 500 milliwatts?
T5B06 If an ammeter calibrated in amperes is used to measure a 3000-milliampere current, what reading would it show?
T5B07 If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?
T5B10 What is the approximate amount of change, measured in decibels (dB), of a power decrease from 12 watts to 3 watts?
T5B11 What is the approximate amount of change, measured in decibels (dB), of a power increase from 20 watts to 200 watts?
T5B12 Which of the following frequencies is equal to 28,400 kHz?
T5B13 If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz?
Group T5C Electronic principles: capacitance; inductance; current flow in circuits; alternating current; definition of RF; DC power calculations; impedance
T5C01 What is the ability to store energy in an electric field called?
T5C02 What is the basic unit of capacitance?
T5C03 What is the ability to store energy in a magnetic field called?
T5C04 What is the basic unit of inductance?
T5C05 What is the unit of frequency?
T5C06 What does the abbreviation RF refer to?
T5C07 What is a usual name for electromagnetic waves that travel through space?
T5C08 What is the formula used to calculate electrical power in a DC circuit?
T5C09 How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?
T5C10 How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?
T5C11 How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
T5C12 What is meant by the term impedance?
T5C13 What are the units of impedance?
Group T5D Ohm's Law: formulas and usage
T5D01 What formula is used to calculate current in a circuit?
T5D02 What formula is used to calculate voltage in a circuit?
T5D03 What formula is used to calculate resistance in a circuit?
T5D04 What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
T5D05 What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?
T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
T5D07 What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
T5D08 What is the current flowing through a 100-ohm resistor connected across 200 volts?
T5D09 What is the current flowing through a 24-ohm resistor connected across 240 volts?
T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?