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

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Ohm's Law: formulas and usage

## The Question Pool[edit]

### Question 1[edit]

- What formula is used to calculate current in a circuit?
- A. Current (I) equals voltage (E) multiplied by resistance (R)
- B. Current (I) equals voltage (E) divided by resistance (R)
- C. Current (I) equals voltage (E) added to resistance (R)
- D. Current (I) equals voltage (E) minus resistance (R)

**The correct answer is B.**

### Question 2[edit]

- What formula is used to calculate voltage in a circuit?
- A. Voltage (E) equals current (I) multiplied by resistance (R)
- B. Voltage (E) equals current (I) divided by resistance (R)
- C. Voltage (E) equals current (I) added to resistance (R)
- D. Voltage (E) equals current (I) minus resistance (R)

**The correct answer is A.**

### Question 3[edit]

- What formula is used to calculate resistance in a circuit?
- A. Resistance (R) equals voltage (E) multiplied by current (I)
- B. Resistance (R) equals voltage (E) divided by current (I)
- C. Resistance (R) equals voltage (E) added to current (I)
- D. Resistance (R) equals voltage (E) minus current (I)

**The correct answer is B.**

### Question 4[edit]

- What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?
- A. 3 ohms
- B. 30 ohms
- C. 93 ohms
- D. 270 ohms

**The correct answer is B.**

### Question 5[edit]

What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

- A. 18 ohms
- B. 0.125 ohms
- C. 8 ohms
- D. 13.5 ohms

**The correct answer is C.**

### Question 6[edit]

- What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
- A. 3 ohms
- B. 16 ohms
- C. 48 ohms
- D. 8 Ohms

**The correct answer is A.**

### Question 7[edit]

- What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
- A. 9600 amperes
- B. 200 amperes
- C. 0.667 amperes
- D. 1.5 amperes

**The correct answer is D.**

### Question 8[edit]

- What is the current flowing through a 100-ohm resistor connected across 200 volts?
- A. 20,000 amperes
- B. 0.5 amperes
- C. 2 amperes
- D. 100 amperes

**The correct answer is C.**

### Question 9[edit]

- What is the current flowing through a 24-ohm resistor connected across 240 volts?
- A. 24,000 amperes
- B. 0.1 amperes
- C. 10 amperes
- D. 216 amperes

**The correct answer is C.**

### Question 10[edit]

- What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
- A. 1 volt
- B. 0.25 volts
- C. 2.5 volts
- D. 1.5 volts

**The correct answer is A.**

### Question 11[edit]

- What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
- A. 1 volt
- B. 10 volts
- C. 11 volts
- D. 9 volts

**The correct answer is B.**

### Question 12[edit]

- What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
- A. 8 volts
- B. 0.2 volts
- C. 12 volts
- D. 20 volts

**The correct answer is D.**