CFAA Fire Alarm Technician · Question
A 24VDC source is connected to two parallel branches. Branch A has 10 Ohms, Branch B has 20 Ohms. What is the total current?
Voltage is the same in parallel. I1 = 24/10 = 2.4A. I2 = 24/20 = 1.2A. Total I = 2.4 + 1.2 = 3.6A. CFAA Manual S1-Ch3.
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Question: A 24VDC source is connected to two parallel branches. Branch A has 10 Ohms, Branch B has 20 Ohms. What is the total current?
Answer options: ✅ 3.6 A
- 0.8 A
- 2.4 A
- 1.2 A
Correct answer: 3.6 A
Explanation: Voltage is the same in parallel. I1 = 24/10 = 2.4A. I2 = 24/20 = 1.2A. Total I = 2.4 + 1.2 = 3.6A. CFAA Manual S1-Ch3.
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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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