CFAA Fire Alarm Technician · Question
A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
P = V²/R. R = 24²/10 = 57.6 Ohms. New Power = 20²/57.6 = 6.94 Watts. CFAA Manual S1-Ch2.
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Question: A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
Answer options:
- 10.0 W
- 8.33 W
- 5.04 W ✅ 6.94 W
Correct answer: 6.94 W
Explanation: P = V²/R. R = 24²/10 = 57.6 Ohms. New Power = 20²/57.6 = 6.94 Watts. CFAA Manual S1-Ch2.
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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 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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