CFAA Fire Alarm Technician · Question
In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, what is the effect on current?
Resistance is proportional to length. Doubling the length doubles the resistance. Since I = V/R, doubling R results in half the current.
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Question: In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, what is the effect on current?
Answer options: ✅ Current decreases by 50%
- Current increases by 50%
- Current remains constant
- Current doubles
Correct answer: Current decreases by 50%
Explanation: Resistance is proportional to length. Doubling the length doubles the resistance. Since I = V/R, doubling R results in half the current.
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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
- 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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