A heater is rated at 1200 watts for a 120-volt source.If two heaters are connected in parallel across the 120-volt source, the current drawn from the source is __________.
Fill in the blank(s) with correct word
[Ques. 2] The resistance of a wire can be increased by
a. making the wire longer. b. lowering the temperature of the wire.
c. making the wire thinner. d. making the wire shorter.
[Ques. 3] Ohmic heating is
a. always undesirable. b. used in light bulbs.
c. what makes fuses blow. d. all of the above.
[Ques. 4] Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be
a. + and +.
b. and .
c. + and .
d. any of the above.
e. not determinable.
[Ques. 5] What does a neutral atom become if it acquires an extra electron?
a. negatively charged
b. positively charged
c. an ion
d. a molecule
[Ques. 6] A battery supplies
a. AC current.
b. DC current.
c. resistance.
d. voltage.
e. positive ions.
[Ques. 7] An electric motor on an airplane operates on 21.5 volts and draws a current of 11.0 amperes. How much energy (in joules) does the motor use during a 9.0-hour flight?
a. 1064.4 b. 2128.5
c. 127710.0 d. 7662600.0
[Ques. 8] Fuses and circuit breakers are used to prevent
a. electrical shocks. b. wires overheating and causing fires.
c. save on the cost of electricity. d. to store energy.
[Ques. 9] A simple electrical circuit has a constant voltage power supply and a variable resistor. As you increase the resistance the current flow _____________
a. increases b. decreases
c. remains the same d. cannot be determined
[Ques. 10] A solid metal wire has a certain resistance. It is heated and carefully stretched to form a longer, thinner wire. After it cools, the resistance is _______ than it was before.
a. greater b. less
c. no more d. lighter
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