CFAA Fire Alarm Technician · Question
A 24VDC circuit has two 12 Ohm resistors in series. What is the current flowing through the second resistor?
In a series circuit, current is the same everywhere. I = V_total / R_total = 24V / (12+12) = 24 / 24 = 1 Amp. Current through R2 is 1A.
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Question: A 24VDC circuit has two 12 Ohm resistors in series. What is the current flowing through the second resistor?
Answer options:
- 2 Amps
- 0.5 Amps ✅ 1 Amp
- 24 Amps
Correct answer: 1 Amp
Explanation: In a series circuit, current is the same everywhere. I = V_total / R_total = 24V / (12+12) = 24 / 24 = 1 Amp. Current through R2 is 1A.
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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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