# Technician Class License Exam Questions

### Subelement T5

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

#### Groups

- T5A - Electrical principles, units, and terms: current and voltage; conductors and insulators; alternating and direct current
- T5B - Math for electronics: conversion of electrical units; decibels; the metric system
- T5C - Electronic principles: capacitance; inductance; current flow in circuits; alternating current; definition of RF; DC power calculations; impedance
- T5D - Ohm's Law: formulas and usage

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?