TL;DR
Study fundamental electrical theory including Ohm's law, circuit analysis, and power calculations. Electrical theory underlies all practical applications and is tested on licensing exams.
Free Ohm's Law & Power Calculations Practice Questions
Journeyman Electrician License Exam · Electrical Theory & Trade Math
This module covers Ohm's Law & Power Calculations as part of the Electrical Theory & Trade Math section, testing your understanding of core concepts and their practical application.
| Exam | Journeyman Electrician License Exam |
| Pass Rate | 55% |
| Duration | 240 minutes |
| Module | Ohm's Law & Power Calculations |
Why Ohm's Law & Power Calculations matters
Ohm's Law & Power Calculations is one of the most tested areas because medication errors are among the most preventable causes of patient harm.
Sample Practice Questions (5)
1. Three resistors of 12 ohms, 24 ohms, and 8 ohms are connected in parallel. What is the total equivalent resistance?
- 4 ohms
- 14.67 ohms
- 44 ohms
- 3.69 ohms
2. A three-phase, 480V motor operates at 85% power factor and draws 52A per line. What is the approximate total power consumed by the motor?
- 21,216W
- 36,734W
- 43,218W
- 31,776W
3. A single-phase 240V motor draws 30A with a power factor of 0.85. What is the true power consumed?
- 7,200W
- 6,120W
- 5,100W
- 8,471W
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Start practicing free →4. A 480V heater element has a resistance of 48 ohms. Using P = V²/R, what is the power dissipated?
- 2,400W
- 4,800W
- 10W
- 23,040W
5. A single-phase transformer has a 10 kVA rating at 240V secondary. What is the maximum secondary full-load current?
- 24A
- 41.67A
- 83.33A
- 48A
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