Practice Test (See related pages) 1 Ohm's law states that the amount of current is inversely proportional to the voltage and directly proportional to the resistance. A) True B) False 2 The fact is that high-voltage circuits usually do have large values of current in electronic equipment. A) True B) False 3 Whenever there is current through a resistance, it must have a potential difference across its two ends equal to the IR product. A) True B) False 4 A graph referred to as the volt-ampere characteristic of R shows how much current the resistor allows for different voltages. A) True B) False 5 A straight-line graph shows that a resistor is linear. A) True B) False 6 The unit of electric power is the watt. A) True B) False 7 One horsepower (hp) is equal to one-half kilowatt. A) True B) False 8 Power is equal to voltage divided by current. A) True B) False 9 Note that the resistor itself is very unlikely to develop a short circuit because of the nature of its construction. A) True B) False 10 Some material whose elements have an atomic structure that allows free electrons to drift through it with more or less force applied is a(n) . 11 The amount of opposition in a resistance that allows one ampere of current with one volt applied is ohm. 12 A straight-line graph shows that a resistor is . 13 When the applied voltage is constant, the current is more with resistance. 14 The rate of doing work is . 15 One horsepower is equal to W. 16 When the current flow in a circuit becomes excessive, a resistor is more likely to . 17 Ohm's law states that current is inversely proportional to . 18 What piece of equipment provides a variable dc output voltage to electronic circuits under test? A) signal generator B) multimeter C) power supply D) oscilloscope 19 What is the potential difference across a one-ohm resistance that has one ampere of current through it? A) volt B) ampere C) watt D) joule 20 A graph that shows how much current a resistor allows for different voltages is called the A) watt-hour characteristic of R B) volt-ampere characteristic of R C) volt-ohm characteristic of R D) joule-ampere characteristic of R 21 An example of a nonlinear resistance is the A) carbon resistor B) copper wire C) tungsten filament D) conductor silver 22 Power is equal to A) V x R B) I x R C) I x V D) I / V 23 What is produced when current flows in a resistance? A) light B) sound C) energy D) heat 24 How much current is needed for a 600-W, 120-V toaster? A) 0.5A B) 5mA C) 5A D) 50mA 25 One of the best safety rules is to A) work on circuits with power disconnected whenever possible B) work while standing on earth ground C) work with power connected whenever possible D) work with both hands in your pockets
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