2. You are employed in a large industrial plant. A 480-V, 5000-W heater is used to melt lead in a large tank. It has been decided that the heater is not sufficient to raise the temperature of the lead to the desired level. A second 5000-W heater is to be installed on the same circuit. What will be the circuit current after installation of the second heater, and what is the minimum size circuit breaker that can be used if this is a continuous-duty circuit?

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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is the total resistan
es with the output of
has a current
through Branch 3
ed in parallel. What
20 2. Three of the
th resistor?
allel. The circuit
esistors?
nt flow SA
in Figure 7-28
in Figure 7-27.
E
R.
E
P₁
HIM
2222
Ez
!!!!
P₁
III
Un
E₁
la
RA
P4
FIGURE 7-27 Determine resistance values using the color and find all missing electrical
values.
PRACTICAL APPLICATIONS
1. You have been hired by a homeowner to install a ceiling fan and light kit in a living
room. The living room luminaire (light fixture) being used at present contains two
60-W lamps. After locating the circuit in the panel box, you find that the circuit
is protected by a 15-A circuit breaker and is run with 14 AWG copper wire. After
turning on all lights connected to this circuit, you have a current draw of 8.6 A and a
voltage of 120 V. The ceiling fan light kit contains four 60-W lamps, and the fan has
a maximum current draw of 1.6 A. Can this fan be connected to the existing living
room circuit? Recall that a continuous-use circuit should not be loaded to more than
80% of its rated capacity.
2. You are employed in a large industrial plant. A 480-V, 5000-W heater is used to melt
lead in a large tank. It has been decided that the heater is not sufficient to raise
the temperature of the lead to the desired level. A second 5000-W heater is to be
installed on the same circuit. What will be the circuit current after installation of the
second heater, and what is the minimum size circuit breaker that can be used if this
is a continuous-duty circuit?
3. You are an electrician. You have been asked by a homeowner to install a lighted mirror
in a bathroom. The mirror contains eight 40-watt lamps. Upon checking the service
panel you discover that the bathroom circuit is connected to a single 120-volt,
20-ampere circuit breaker. At present, the circuit supplies power to an electric wall
heater rated at 1000 watts, a ceiling fan with a light kit, and a light fixture over the
mirror. The fan motor has a full-load current draw of 3.2 amperes and the light kit
Transcribed Image Text:is the total resistan es with the output of has a current through Branch 3 ed in parallel. What 20 2. Three of the th resistor? allel. The circuit esistors? nt flow SA in Figure 7-28 in Figure 7-27. E R. E P₁ HIM 2222 Ez !!!! P₁ III Un E₁ la RA P4 FIGURE 7-27 Determine resistance values using the color and find all missing electrical values. PRACTICAL APPLICATIONS 1. You have been hired by a homeowner to install a ceiling fan and light kit in a living room. The living room luminaire (light fixture) being used at present contains two 60-W lamps. After locating the circuit in the panel box, you find that the circuit is protected by a 15-A circuit breaker and is run with 14 AWG copper wire. After turning on all lights connected to this circuit, you have a current draw of 8.6 A and a voltage of 120 V. The ceiling fan light kit contains four 60-W lamps, and the fan has a maximum current draw of 1.6 A. Can this fan be connected to the existing living room circuit? Recall that a continuous-use circuit should not be loaded to more than 80% of its rated capacity. 2. You are employed in a large industrial plant. A 480-V, 5000-W heater is used to melt lead in a large tank. It has been decided that the heater is not sufficient to raise the temperature of the lead to the desired level. A second 5000-W heater is to be installed on the same circuit. What will be the circuit current after installation of the second heater, and what is the minimum size circuit breaker that can be used if this is a continuous-duty circuit? 3. You are an electrician. You have been asked by a homeowner to install a lighted mirror in a bathroom. The mirror contains eight 40-watt lamps. Upon checking the service panel you discover that the bathroom circuit is connected to a single 120-volt, 20-ampere circuit breaker. At present, the circuit supplies power to an electric wall heater rated at 1000 watts, a ceiling fan with a light kit, and a light fixture over the mirror. The fan motor has a full-load current draw of 3.2 amperes and the light kit
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