A lunchbox rated at 100 A indicates what electrical capability?

• A. Voltage rating
• B. Current carrying capacity
• C. Power rating
• D. Resistance

Answer: (B)

The main idea here is ampacity—the current carrying capability of a device. A lunchbox rated at 100 A is specifying how much current it can carry safely. That means the internal conductors, connectors, and insulation are designed to handle up to 100 amperes without overheating or degrading. Exceeding that current can cause overheating, insulation damage, or failure.

Voltage, power, and resistance are different properties. The voltage rating is the maximum voltage the device can withstand, separate from how much current it can carry. The power rating tells you how much electrical power the device can handle or deliver, which depends on both voltage and current (P = V × I). Resistance is a property that relates voltage to current for a component (R = V / I) and isn’t described by a current rating alone.