Final answer:
A circuit breaker is a device used to protect electrical circuits and prevent damage from large currents. Different appliances require different amounts of current to operate properly.
Step-by-step explanation:
A circuit breaker is a device that is used to protect electrical circuits and prevent damage from large currents. It is rated in amperes, typically ranging from 10 to 30 amps, and reacts quickly to open the circuit when the current exceeds the desired limits. Circuit breakers are commonly used in homes to protect residents from harm and appliances from damage.
For example, a single 15-amp circuit breaker may be used to protect several outlets in the living room, while a single 20-amp circuit breaker may be used to protect the refrigerator in the kitchen.
By using circuit breakers of different amp ratings for different appliances, we can deduce that different appliances require different amounts of current to operate properly.