The airplane's electrical system is predominantly what type of power?

The airplane's electrical system is predominantly what type of power?

• A. Direct current power
• B. Alternating current power
• C. Both AC and DC equally
• D. None of the above

Answer: (A)

Most of the airplane’s electrical power on this aircraft is supplied as direct current (DC). The primary power distribution is a 28-volt DC system, with generators and batteries feeding the DC buses that run the vast majority of loads—things like avionics, lighting, and control systems. AC power exists, but only for non‑core needs or special equipment, usually provided via inverters or separate AC buses at 115 volts/400 Hz. So, while AC is present for certain applications, the vast majority of the electrical system operates on DC, making direct current power the predominant type.

Most of the airplane’s electrical power on this aircraft is supplied as direct current (DC). The primary power distribution is a 28-volt DC system, with generators and batteries feeding the DC buses that run the vast majority of loads—things like avionics, lighting, and control systems. AC power exists, but only for non‑core needs or special equipment, usually provided via inverters or separate AC buses at 115 volts/400 Hz. So, while AC is present for certain applications, the vast majority of the electrical system operates on DC, making direct current power the predominant type.