Determine the minimum number of 120-volt, 15-ampere lighting circuits required for a dwelling unit with a computed lighting load of 12,000 volt amps.

To determine the minimum number of 120-volt, 15-ampere lighting circuits required for a dwelling unit with a computed lighting load of 12,000 volt-amperes, it's essential to understand how to perform the calculation based on the given values.

First, calculate the load that each 15-ampere circuit can handle. The formula for the wattage of a circuit is:

[ \text{Wattage} = \text{Voltage} \times \text{Current} ]

For a 120-volt circuit with a 15-ampere rating:

[ \text{Wattage} = 120 , \text{volts} \times 15 , \text{amperes} = 1,800 , \text{watts} ]

To convert this into volt-amperes (which are the same as watts in a purely resistive load), this value can be understood as 1,800 volt-amperes per circuit.

Next, to find the total number of circuits needed to accommodate the total load of 12,000 volt-amperes, divide the total load by the capacity of one circuit:

[ \text{Number of circuits} =