CFAA Fire Alarm Technician · Question
A notification circuit is loaded to 48 Watts at 24VDC. Calculate the total circuit resistance.
Current = Power / Voltage. I = 48W / 24V = 2 Amps. Resistance = Voltage / Current = 24V / 2A = 12 Ohms. (Or R = V^2 / P = 576 / 48 = 12).
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Question: A notification circuit is loaded to 48 Watts at 24VDC. Calculate the total circuit resistance.
Answer options:
- 0.5 Ω
- 2.0 Ω ✅ 12 Ω
- 24 Ω
Correct answer: 12 Ω
Explanation: Current = Power / Voltage. I = 48W / 24V = 2 Amps. Resistance = Voltage / Current = 24V / 2A = 12 Ohms. (Or R = V^2 / P = 576 / 48 = 12).
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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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