CFAA Fire Alarm Technician · Question
Calculate the minimum battery size for a system with: Standby Current = 0.5A, Alarm Current = 2.0A, Requirements = 24h Standby + 30m Alarm. (Include 1.25 safety factor).
Standby = 0.5A * 24h = 12Ah. Alarm = 2.0A * 0.5h = 1Ah. Total = 13Ah. Apply 1.25 factor = 16.25Ah. Smallest standard size is 18Ah.
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Question: Calculate the minimum battery size for a system with: Standby Current = 0.5A, Alarm Current = 2.0A, Requirements = 24h Standby + 30m Alarm. (Include 1.25 safety factor).
Answer options:
- 13 Ah ✅ 18 Ah
- 24 Ah
- 7 Ah
Correct answer: 18 Ah
Explanation: Standby = 0.5A * 24h = 12Ah. Alarm = 2.0A * 0.5h = 1Ah. Total = 13Ah. Apply 1.25 factor = 16.25Ah. Smallest standard size is 18Ah.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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