Figure 121.402
Refer to Figure 121.402. The track is connected to a 1-pole
breaker in a -volt, 10 panel. Each luminaire (head) has a
lamp with a rating of 150 watts at 130 volts. When all the lamps
are operating, the circuit will draw _amps.
Select one:
a. 1.25
b. 16.09
o c. 7.46
d. 8.75
d. 5.33
e. 5.3

Question

Figure 121.402
Refer to Figure 121.402. The track is connected to a 1-pole
breaker in a

-volt, 10 panel. Each luminaire (head) has a
lamp with a rating of 150 watts at 130 volts. When all the lamps
are operating, the circuit will draw _amps.
Select one:
a. 1.25
b. 16.09
o c. 7.46
d. 8.75
d. 5.33
e. 5.3

UpStudy AI · Accepted Answer

The key is to determine the total current drawn by the track lighting system when all luminaires (heads) are in operation. We are told that each luminaire has a lamp rated at $$150$$ watts at $$130$$ volts, and the system is connected to a $$120\text{/}240$$ panel via a 1‐pole (i.e. $$120$$‐volt) circuit. (Even though the lamp is rated at $$130$$ volts, for circuit calculations on the $$120$$–volt circuit the $$120$$–volt value is used.)

Step 1. Determine the number of luminaires  
From the figure reference (Figure 121.402) it is shown that there are $$7$$ luminaire heads on the track.

Step 2. Compute the total wattage  
Each luminaire is $$150$$ watts so the total wattage is  
$$
\text{Total Wattage} = 7 \times 150 = 1050\text{ watts}.
$$

Step 3. Find the total current drawn  
On a $$120$$–volt circuit, the current drawn is calculated as  
$$
I = \frac{P}{V} = \frac{1050}{120} \approx 8.75\text{ amps}.
$$

Thus, when all the lamps are operating the circuit will draw approximately $$8.75$$ amps.
The circuit will draw approximately 8.75 amps when all lamps are operating.

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