# FCC Technician Class Exam Study Guide - 2014-2018/Subelement T5 Group C

Electronic principles: capacitance; inductance; current flow in circuits; alternating current; definition of RF; DC power calculations; impedance

## The Question Pool edit

### Question 1 edit

- What is the ability to store energy in an electric field called?
- A. Inductance
- B. Resistance
- C. Tolerance
- D. Capacitance

**The correct answer is D.**

### Question 2 edit

- What is the basic unit of capacitance?
- A. The farad
- B. The ohm
- C. The volt
- D. The henry

**The correct answer is A.**

### Question 3 edit

- What is the ability to store energy in a magnetic field called?
- A. Admittance
- B. Capacitance
- C. Resistance
- D. Inductance

**The correct answer is D.**

### Question 4 edit

- What is the basic unit of inductance?
- A. The coulomb
- B. The farad
- C. The henry
- D. The ohm

**The correct answer is C.**

### Question 5 edit

- What is the unit of frequency?
- A. Hertz
- B. Henry
- C. Farad
- D. Tesla

**The correct answer is A.**

### Question 6 edit

- What does the abbreviation "RF" refer to?
- A. Radio frequency signals of all types
- B. The resonant frequency of a tuned circuit
- C. The real frequency transmitted as opposed to the apparent frequency
- D. Reflective force in antenna transmission lines

**The correct answer is A.**

### Question 7 edit

- What is a usual name for electromagnetic waves that travel through space?
- A. Gravity waves
- B. Sound waves
- C. Radio waves
- D. Pressure waves

**The correct answer is C.**

### Question 8 edit

- What is the formula used to calculate electrical power in a DC circuit?
- A. Power (P) equals voltage (E) multiplied by current (I)
- B. Power (P) equals voltage (E) divided by current (I)
- C. Power (P) equals voltage (E) minus current (I)
- D. Power (P) equals voltage (E) plus current (I)

**The correct answer is A.**

### Question 9 edit

- How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?
- A. 138 watts
- B. 0.7 watts
- C. 23.8 watts
- D. 3.8 watts

**The correct answer is A.**

### Question 10 edit

- How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?
- A. 4.8 watts
- B. 30 watts
- C. 14.5 watts
- D. 0.208 watts

**The correct answer is B.**

### Question 11 edit

- How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts?
- A. 0.1 amperes
- B. 10 amperes
- C. 12 amperes
- D. 132 amperes

**The correct answer is B.**

### Question 12 edit

- What is meant by the term impedance?
- A. It is a measure of the opposition to AC current flow in a circuit
- B. It is the inverse of resistance
- C. It is a measure of the Q or Quality Factor of a component
- D. It is a measure of the power handling capability of a component

**The correct answer is A.**

### Question 13 edit

- What are the units of impedance?
- A. Volts
- B. Amperes
- C. Coulombs
- D. Ohms

**The correct answer is D.**