Entry Exam Category: High School Equivalency Exams
Course: General Education Development (GED)
Exam: GED Science and Practice Test
Practice Question
Extract
Different types of light bulbs use different amounts of electricity. Electricity use is measured in kilowatt hours (kWh). The electricity use per hour (kWh) of an electrical device can be calculated using the following equation:
A 60W light bulb used .48 kilowatt hours of electricity. How long was the light bulb on?
Answer Choices
- A: 0.48 hours
- B: 28.8 hours
- C: 0.125 hours
- D: 8 hours
Correct Answer: D
Rationale: Power (W) = Energy (kWh) / Time (h). Convert 0.48 kWh to 480 Wh, then Time = 480 Wh / 60 W = 8 hours.