Electricity: Electric Circuits
Electric Circuits: Audio Guided Solution
Problem 3:
Determine the amount of time that the following devices would have to be used before 1.0x106 C (1 million Coulombs) of charge passes through them.
a. LED night light (I=0.0042 A)
b. Incandescent night light (I=0.068 A)
c. 60-Watt incandescent light bulb (I=0.50 A)
d. Large bathroom light fixture (I=2.0 A)
a. LED night light (I=0.0042 A)
b. Incandescent night light (I=0.068 A)
c. 60-Watt incandescent light bulb (I=0.50 A)
d. Large bathroom light fixture (I=2.0 A)
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a. 2.4x108 sec = 6.6x104 hr = 2.8x103 d = 7.5 yr
b. 1.5x107 sec = 4.1x103 hr = 170 d
c. 2.0x106 s = 560 hr = 23 d
d. 5.0x105 s = 140 hr = 5.8 d
b. 1.5x107 sec = 4.1x103 hr = 170 d
c. 2.0x106 s = 560 hr = 23 d
d. 5.0x105 s = 140 hr = 5.8 d
- Read the problem carefully and develop a mental picture of the physical situation. If necessary, sketch a simple diagram of the physical situation to help you visualize it.
- Identify the known and unknown quantities and record them in an organized manner. Equate given values to the symbols used to represent the corresponding quantity - e.g., ΔV = 9.0 V; R = 0.025 Ω; I = ???.
- Use physics formulas and conceptual reasoning to plot a strategy for solving for the unknown quantity.
- Identify the appropriate formula(s) to use.
- Perform substitutions and algebraic manipulations in order to solve for the unknown quantity.
Get more information on the topic of Electric Circuits at The Physics Classroom Tutorial.
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