It depends on the wattage of each bulb. Typically you only want to load your circuit to 80% of its rated capacity. Hence a 15 A circuit would be .8 x 15 Amps. Now if you had all 60 Watt bulbs and the supply voltage as 120 V then you could support 24 such bulbs. The key formulas are Voltage = Current x Resistance and Watts = Voltage x Current in your lighting example. However, if the lighting fixtures are rated for a higher value and you just choose to use 60 watts, you should size to the rated capacity of the fixtures on the circuit since someone else may later put in the maximum rated bulb.
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It's recommended not to exceed 80% of a circuit's capacity, so for a 15 amp breaker, you should only have about 12 amps of load. The wattage of the flood lights will determine how many can be on the breaker - for example, if each flood light is 100 watts, you could have about 12 flood lights on the 15 amp breaker.
The number of can lights that can go on one breaker will depend on the wattage of each light and the maximum load capacity of the breaker. It's important to calculate the total wattage of all the lights and ensure it does not exceed the amp rating of the breaker to avoid overloading it. Consult with an electrician to determine the appropriate number of can lights that can safely go on one breaker.
Generally, a 15 amp breaker can safely handle around 1440 watts of power. The number of lights that can run off this breaker depends on the wattage of each light. As a guideline, if each light consumes around 60-75 watts, you can safely run about 16-24 lights on a 15 amp breaker.
Depending on the efficiency of the flood lights, you should be able to safely run one 500 watt flood light on a 13 amp plug. Keep in mind that it's important not to exceed the amp limit to prevent overheating and potential fire hazards.
A 15 amp breaker is not sufficient for a 225 amp load. You would need a breaker that matches the load current, such as a 225 amp breaker. Using a 15 amp breaker for a 225 amp load would cause the breaker to trip immediately due to overcurrent.
On a 15 amp breaker, you can draw up to 120 volts in a standard residential circuit. The voltage remains constant at 120 volts, but the amperage capacity is what is limited by the 15 amp breaker.