CFAA Fire Alarm Technician · Question
If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the current draw?
P = V * I. Therefore I = P / V. 60W / 120V = 0.5A. CFAA Manual S1-Ch2.
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Question: If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the current draw?
Answer options:
- 2.0 A
- 5.0 A ✅ 0.5 A
- 7.2 A
Correct answer: 0.5 A
Explanation: P = V * I. Therefore I = P / V. 60W / 120V = 0.5A. CFAA Manual S1-Ch2.
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Question explanations
- The primary power for a fire alarm system must be:
- 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?
- A circuit has a total resistance of 40 Ohms and is connected to a 24VDC source. What is the total power dissip
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