Circuit breaker description?

Circuit breaker description?

• A. Contains a metal piece that expands when it gets too hot, breaking the circuit and stopping current until it cools
• B. Stores electrical energy
• C. Increases current
• D. Converts AC to DC

Answer: (A)

Circuit breakers protect circuits by interrupting current when things get too hot. The description with a metal piece that expands as it heats is capturing how many breakers trip: a bimetallic strip heats up as current flows, its two metals expand at different rates and bend, which releases a latch and opens the contacts to stop the current. It then stays open until it cools and can be reset. This behavior is distinct from simply storing energy (like a battery or capacitor), increasing current (a breaker doesn’t boost current), or converting AC to DC (rectifiers do that).

Circuit breakers protect circuits by interrupting current when things get too hot. The description with a metal piece that expands as it heats is capturing how many breakers trip: a bimetallic strip heats up as current flows, its two metals expand at different rates and bend, which releases a latch and opens the contacts to stop the current. It then stays open until it cools and can be reset. This behavior is distinct from simply storing energy (like a battery or capacitor), increasing current (a breaker doesn’t boost current), or converting AC to DC (rectifiers do that).