Which statement is true about single-pole breakers?

• A. They provide 240V and typically have a rating of 15 to 50 amps
• B. They provide 120V and typically have a rating of 15 to 20 amps
• C. They provide 240V and typically have a rating of 5 to 10 amps
• D. They provide 480V

Answer: (B)

Single-pole breakers are used on standard household circuits to protect a single hot conductor. They deliver 120 volts between the hot wire and neutral, which is why they’re commonly used for lights and outlets. Their typical ampere rating is 15 to 20 amps, the range you’ll see on most residential circuits. They don’t provide 240 volts—those require two hot legs and a two-pole breaker—nor the higher voltages like 480 volts found in some industrial settings. So the statement that describes 120V with a 15–20 amp rating fits how these breakers are used in most homes.