A landing light draws 9 A from a 28 V DC bus. How much power does it use?
Answer in W.
Show the answer
252 W
P = E × I = 28 V × 9 A = 252 W.
Reference: FAA-H-8083-30, Fundamentals of Electricity and Electronics (power)
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Electricity practice questions
28 questions from the aviation mechanic general practice test.
Electricity practice test
10 questions, graded as you go, with the reason for every answer. No sign-up.
What this covers
- Meters
- Semiconductors
- Ohm's law
- Power
- Series circuits
- Voltage drop
- Batteries
- Parallel circuits
- Inductive reactance
- Transformers
- AC values
- Series-parallel circuits
- Capacitive reactance
- Impedance
Sample questions
Three resistors of 6 Ω, 10 Ω and 12 Ω are wired in series across a 28 V source. What current flows in the circuit?
Answer in A.
Show the answer
1 A
Rt = 6 + 10 + 12 = 28 Ω. I = E ÷ Rt = 28 V ÷ 28 Ω = 1 A.
Reference: FAA-H-8083-30, Fundamentals of Electricity and Electronics (series DC circuits)
A feeder cable with a total resistance of 0.05 Ω carries 40 A to a motor. What is the voltage drop in the cable?
Answer in V.
Show the answer
2 V
E = I × R = 40 A × 0.05 Ω = 2 V.
Reference: FAA-H-8083-30, Fundamentals of Electricity and Electronics (Ohm's law; voltage drop)