15 Amp Breaker How Many Watts

A 15 Amp Breaker: How Many Watts?

A 15 amp breaker is a common electrical component found in residential and commercial buildings. It is designed to protect electrical circuits from overload, ensuring the safety of the electrical system and preventing potential hazards such as electrical fires. One important aspect to consider when using a 15 amp breaker is the maximum wattage it can handle.

Understanding Amps and Watts

Before we delve into the specifics of a 15 amp breaker, let’s take a moment to understand amps and watts. Amps (amperes) measure the electrical current flowing through a circuit, while watts measure the power consumed by an electrical device. The relationship between amps and watts can be calculated using Ohm’s Law, which states that power (in watts) is equal to the current (in amps) multiplied by the voltage (in volts).

The maximum wattage a 15 amp breaker can handle depends on the voltage of the circuit it is protecting. In a standard 120-volt residential circuit, the maximum wattage would be calculated as follows:

Watts = Amps x Volts
Watts = 15 amps x 120 volts
Watts = 1800 watts

Therefore, a 15 amp breaker can handle a maximum load of 1800 watts on a 120-volt circuit. It is worth noting that this calculation assumes a continuous load. If the load is intermittent or non-continuous, such as with certain appliances or lighting fixtures, a higher wattage may be temporarily supported.


Q: Can I exceed the maximum wattage on a 15 amp breaker?
A: It is not recommended to exceed the maximum wattage specified for a 15 amp breaker. Doing so can cause the breaker to trip, shutting off power to the circuit. Additionally, exceeding the maximum wattage can lead to overheating of the wiring and potentially cause electrical fires.

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Q: Can I use a 15 amp breaker for a higher voltage circuit?
A: No, a 15 amp breaker is specifically designed for use in 120-volt circuits. If you need to protect a higher voltage circuit, such as 240 volts, you would need to use a breaker with a higher amp rating that matches the requirements of the circuit.

Q: How can I determine the wattage of an electrical device?
A: The wattage of an electrical device can usually be found on the device itself or in its user manual. If this information is not readily available, you can use a watt meter or power monitor to measure the device’s power consumption.

Q: Can I replace a 15 amp breaker with a higher amp rating?
A: It is generally not recommended to replace a 15 amp breaker with a higher amp rating without consulting a qualified electrician. Breakers are designed to protect specific circuits, and replacing a breaker with a higher amp rating can overload the wiring and pose safety risks.

In conclusion, a 15 amp breaker can handle a maximum load of 1800 watts on a 120-volt circuit. It is important to adhere to this maximum wattage to ensure the safety and proper functioning of the electrical system. If you have any doubts or questions about the electrical load on a circuit, it is always best to consult with a licensed electrician for guidance and assistance.