ELECTRICITY FOR TRADES (LOOSELEAF)
3rd Edition
ISBN: 9781260437454
Author: Petruzella
Publisher: MCG
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Textbook Question
Chapter 7.2, Problem 6RQ
An electric soldering iron with a 40-Ω heating element is plugged into a 120-V outlet. How much current will be drawn by the iron?
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Two heating units A and B are connected parallel across a 240-volt supply. Unit B takes thrre-times as much power in A, and the total power is 2400 Watts. Determine resistances of A and B.
Two 115-V incandescent lamps A & B are connected in series across 230-V dc source.
Lamp A is rated 100 W and lamp B is rated 60 W. Which lamp is abnormally bright
and hence will burn out soon?
a) Lamp A
b) Lamp B
c) Both lamps will be abnormally bright
d) Both lamps will work normally
O a. Lamp A
O b. Lamp B
O c. Both lamps will be abnormally bright
O d. Both lamps will work normally
When a voltage of 100 volts at 50 Hz is applied to a series connection of a resistor Aand an inductor A, the current taken is 8 A and the power is 120 watts. When appliedto another series connection of a resistor B and an inductor B, the current is 10 A andthe power is 500 watts. What current and power will be taken when 100 V is appliedto the two coils in series?
Chapter 7 Solutions
ELECTRICITY FOR TRADES (LOOSELEAF)
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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