ELECTRICITY FOR THE TRADES W/ACCESS
3rd Edition
ISBN: 9781264605309
Author: Petruzella
Publisher: MCG
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Textbook Question
Chapter 7.2, Problem 4RQ
A pilot lamp with 12 volts applied to it draws a current of 3 amperes. What is the hot resistance of the bulb filament? (Hot resistance refers to the resistance of the bulb filament under normal operating condition and is much higher than its cold or out-of-circuit resistance.)
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Question 2
A transistor is used as a switch and the waveforms are shown in Figure 2. The parameters are
Vcc = 225 V, VBE(sat) = 3 V, IB = 8 A, VCE(sat) = 2 V, Ics = 90 A, td = 0.5 µs, tr = 1 µs, ts = 3 µs, tƒ
= 2 μs, and f
10 kHz. The duty cycle is k 50%. The collector- emitter leakage current is
ICEO = 2 mA. Determine the power loss due to the collector current:
=
=
=
(a) during turn-on ton = td + tr
VCE
Vcc
(b) during conduction period tn
V CE(sat)
0
toff"
ton
Ics
0.9 Ics
(c) during turn-off toff = ts + tf
(d) during off-time tot
(e) the total average power losses PT
ICEO
0
IBS
0
Figure 2
V BE(sat)
0
主
*
td
tr
In
Is
If
to
iB
VBE
T= 1/fs
Question 1:
The beta (B) of the bipolar transistor shown in Figure 1 varies from 12 to 60. The load resistance
is Rc = 5. The dc supply voltage is VCC = 40 V and the input voltage to the base circuit is
VB = 5 V. If VCE(sat) = 1.2 V, VBE(sat) = 1.6 V, and RB = 0.8 2, calculate:
(a) the overdrive factor ODF.
(b) the forced ẞ
(c) the power loss in the transistor PT.
IB
VB
RB
+
V BE
RC
Vcc'
Ic
+
IE
Figure 1
VCE
I need help in creating a matlab code to find the currents
Chapter 7 Solutions
ELECTRICITY FOR THE TRADES W/ACCESS
Ch. 7.1 - What is the base unit and symbol used for...Ch. 7.1 - Write the metric prefix and symbol used to...Ch. 7.1 - Convert each of the following: a. 2,500 to...Ch. 7.2 - State Ohms law.Ch. 7.2 - List the three formulas associated with Ohms law.Ch. 7.2 - Calculate the unknown value for each circuit (a)...Ch. 7.2 - A pilot lamp with 12 volts applied to it draws a...Ch. 7.2 - A resistor has a resistance of 220 . The current...Ch. 7.2 - An electric soldering iron with a 40- heating...Ch. 7.2 - A baseboard heater draws a current of 8 A when...
Ch. 7.2 - A sensor module has an internal resistance of...Ch. 7.2 - The current through and the voltage drop across a...Ch. 7.2 - The heating element for an electric floor heating...Ch. 7.2 - How much power is lost in the form of heat when 25...Ch. 7.2 - The voltage drop across a 330- resistor is...Ch. 7.2 - A digital multimeter display indicates a reading...Ch. 7.2 - Calculate the unknown value for each circuit (a)...Ch. 7.2 - Assume that applying 120 volts to a resistive load...Ch. 7.2 - The voltage drop across a 10-W, 330- resistor is...Ch. 7.2 - The cold resistance of a tungsten lamp filament is...Ch. 7.2 - An electric baseboard heater is rated for 1200 W...Ch. 7.2 - A lamp dimmer switch is rated for 5 A at 120 V....Ch. 7.2 - A 400-W 4- public address speaker is to be fused...
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