Question
How can you determine the length of time that equipment can be powered from a battery?
Answer Options
- A) Divide the watt-hour rating of the battery by the peak power consumption of the equipment
- B) Divide the battery ampere-hour rating by the average current draw of the equipment
- C) Multiply the watts per hour consumed by the equipment by the battery power rating
- D) Multiply the square of the current rating of the battery by the input resistance of the equipment
Correct Answer: B
Explanation
Battery capacity is rated in ampere-hours (Ah), which is the amount of current (Amperes) the battery can deliver for a specific period (Hours). Equipment consumption is measured by its average current draw (Amperes).
To find the length of time (Hours) you can operate, you simply perform a division: \text{Time} = \text{Capacity (Ah)} / \text{Current Draw (A)}. For example, a 12\text{ Ah} battery powering a radio drawing an average of 1.2\text{ A} will last for 12\text{ Ah} / 1.2\text{ A} = 10 \text{ hours}.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!