ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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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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If Va = 12V, Ve = 0V, R1= 10 Ohms, and R2=R3=5 Ohms, solve all currents, i, and voltages, V in the circuit.
*
7.29 The current source in the circuit of Fig. P7.29 is given by
is(t) = 12 cos(2л × 10¹t — 60°) mA.
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Apply the phasor-domain analysis technique to determine ic(t),
given that R= 20 2 and C = 1 μF.
PROBLEMS
7.33 Find ia(t) in the circuit of Fig. P7.33, given that
Us(t) = 40 sin(200t -20°) V.
Chapter 7 Solutions
ELECTRICITY FOR TRADES
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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