Amazon Maintenance Technician: Math Ohm's Law 2 — Questions and Answers
Question 1: Using Ohm's Law, if voltage is 120V and resistance is 40Ω, what is the current?
- 2A
- 3A (Correct answer)
- 4A
- 5A
Correct answer: 3A
I = V ÷ R = 120 ÷ 40 = 3 amperes.
Ohm's Law states I = V/R. With V = 120V and R = 40Ω, I = 120/40 = 3A. Calculating current from voltage and resistance is a foundational skill for Amazon Maintenance Technicians who work with electrical systems in fulfillment centers.
Question 2: A circuit has a current of 5A and resistance of 24Ω. What is the voltage?
- 100V
- 110V
- 120V (Correct answer)
- 130V
Correct answer: 120V
V = I × R = 5 × 24 = 120 volts.
Using V = I × R: V = 5A × 24Ω = 120V. This calculation is essential for Amazon Maintenance Technicians who must verify circuit voltages against design specifications to ensure safe and proper equipment operation.
Question 3: The voltage across a resistor is 60V and the current through it is 2A. What is the resistance?
- 25Ω
- 28Ω
- 30Ω (Correct answer)
- 32Ω
Correct answer: 30Ω
R = V ÷ I = 60 ÷ 2 = 30 ohms.
Using R = V/I: R = 60V ÷ 2A = 30Ω. Calculating resistance from measured voltage and current allows maintenance technicians to verify component values and diagnose whether components are within specification.
Question 4: Three resistors of 10Ω, 20Ω, and 30Ω are connected in series. What is the total resistance?
- 50Ω
- 55Ω
- 60Ω (Correct answer)
- 65Ω
Correct answer: 60Ω
Series resistance: R_total = R1 + R2 + R3 = 10 + 20 + 30 = 60Ω.
In a series circuit, total resistance is the sum of individual resistances: 10 + 20 + 30 = 60Ω. Series circuit analysis is a foundational skill for Amazon Maintenance Technicians who diagnose and maintain conveyor and automation systems.
Question 5: A motor draws 15A from a 240V supply. What is the power consumed?
- 3,200W
- 3,400W
- 3,600W (Correct answer)
- 3,800W
Correct answer: 3,600W
P = V × I = 240 × 15 = 3,600 watts.
Using the power formula P = V × I: P = 240V × 15A = 3,600W. Power calculations help maintenance technicians assess whether motors and drives are operating within their rated power specifications, preventing overloads and equipment damage.
Question 6: A resistor has a rated power of 10W and a resistance of 40Ω. What is the maximum safe voltage across it?
- 16V
- 18V
- 20V (Correct answer)
- 22V
Correct answer: 20V
P = V²/R → V² = P × R = 10 × 40 = 400 → V = √400 = 20V.
Using P = V²/R, rearrange to V = √(P × R) = √(10 × 40) = √400 = 20V. Knowing the maximum safe voltage prevents component overloading. Amazon Maintenance Technicians use this calculation when selecting or replacing resistors and passive components in control circuits.
Amazon Maintenance Technician: Math Ohm's Law 2
Using Ohm's Law, if voltage is 120V and resistance is 40Ω, what is the current?