True/False
Indicate whether the sentence or statement is true or
false.
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1.
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An
ammeter is connected to the circuit in series.
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2.
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A
voltmeter is connected to a circuit in series.
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3.
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As
more lights are added in series, the brightness of the lightbulbs stays the
same.
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4.
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As
more lights are added in parallel, the brightness of each bulb stays the same.
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5.
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Conductors allow electric charges to move easily through them.
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6.
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Like
charges attract and opposite charges repel each other.
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7.
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You
can ground a charged object by connecting it to Earth with a conductor.
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8.
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Electric current refers to electric charges at rest.
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9.
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A 1400
W electric baseboard heater consumes more energy per minute than does a 1000 W kettle.
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10.
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A
simple series electrical circuit consists of a battery, some wires, one light bulb, and a switch. To
control the light bulb, the switch must be located as close to the light bulb as
possible.
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Multiple Choice
Identify the letter of the choice that
best completes the statement or answers the question.
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11.
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Which
of the following most accurately explains the difference between an insulator and a
conductor? a. | A conductor traps
and holds electrons more readily than an insulator. | c. | Insulators are metals, while conductors are usually
synthetic materials. | b. | Insulators do not allow charges to move freely through
them, but conductors do. | d. | Rubbing a conductor with fur will cause it to stick to a wall, but
rubbing an insulator with fur will not have any effect.
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12.
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Consider the charges on the spheres shown. Which statement below is not
accurate?
a. | Object A will
attract object C | c. | D will be attracted to Object A only, and be
repelled by the other objects | b. | Object B will repel Object A and
attract Object C | d. | Object B will attract Object D.
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13.
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What
is the main purpose of a lightning rod on top of a building? a. | It prevents
lightning from striking the building. | c. | It encourages the
lightning to remain stored in the cloud. | b. | It provides a safe path into the ground for the lightning.
| d. | It repels thunderstorms. | | | | |
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14.
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An
object has 10 negative charges. What must be added to it for it to be neutral? a. | 10 negative charges | c. | 10 positive charges | b. | 10 neutral charges | d. | Nothing. It is already
neutral. | | | | |
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15.
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A
neutral object has electrons added to it. This object is now a. | negatively charged | c. | neutral | b. | positively charged | d. | none of the above | | | | |
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16.
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In a
circuit containing ONE bulb, the voltage drop across the bulb is ________ the voltage gain across the
battery a. | less
than | c. | equal to | b. | greater than | d. | none of the above | | | | |
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17.
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From
which terminal do electrons leave a battery? a. | positive | c. | neutral | b. | negative | d. | none of the above | | | | |
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18.
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Current is measured at several points in a series circuit. The
current.... a. | is higher closer
to the battery | c. | is always the same | b. | is lower after the electrons move through the
light. | d. | none of the above. | | | | |
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19.
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Two
light bulbs are connected in series to a battery. One bulb is unscrewed. What happens to
the brightness of the other bulb? a. | it increases | c. | it dims | b. | it goes out | d. | none of the above | | | | |
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20.
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Two
light bulbs are connected in parallel to a battery. One bulb is unscrewed. What happens
to the brightness of the other bulb? a. | it increases
| c. | it dims
| b. | it goes
out | d. | it stays the same | | | | |
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21.
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The
formula for Ohm's law is R = V/I. Which description best fits this formula? a. | Potential difference equals energy divided by charge.
| c. | Resistance equals current divided by potential difference.
| b. | Resistance equals
potential difference divided by current. | d. | Current equals
charge divided by time. | | | | |
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22.
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A
series circuit contains 3 identical light bulbs. The current measured as electrons are leaving
the battery is 3 A. What is the current measured after the third light bult?
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23.
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Three
identical light bulbs are connected in series to a 9 V battery. What is the potential
difference across the first light?
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24.
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3
identical light bulbs are connected in parallel. The current leaving the battery is 3 A.
What is the current through one of the lights?
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25.
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3
identical light bulbs are connected in parallel to a 9 V battery. What is the potential
difference across one of the lights?
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26.
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A
flashlight bulb has an average resistance of 3 S. Flashlight batteries provide a potential
difference of 1.5 V. What amount of current passes through the flashlight?
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27.
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A
kettle has a power rating of 1000 W. It takes 10 minutes to boil water. How much energy
does the kettle actually consume? a. | 100 J | c. | 1.67 J | b. | 10 000 J | d. | 6 000 000 J | | | | |
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28.
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A
light bulb uses 10 000 J of electrical energy. It emits 1 000 J of light energy. What is
the percent efficiency of the light? a. | 10 % | c. | 50 % | b. | 100 % | d. | 20 % | | | | |
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Matching
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Actions of a negatively charged electroscope: Match the item with its
correct description. a. | The leaves move further apart and remain
there | b. | No change in the
position of the leaves is detected. | c. | The leaves move closer together,
temporarily. | d. | The leaves move
closer together, and stay that way. | e. | The leaves fall back and hang vertically, indicating no
charge on the electroscope. | | |
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29.
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A
positive rod is brought near the electroscope.
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30.
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A very
negative rod is touched to the sphere on top of the electroscope.
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31.
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A
small neutral rod is touched to the sphere on top of the electroscope
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32.
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A
copper wire connected to a water pipe is touched to the sphere on the top of the
electroscope.
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33.
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A
neutral rod is brought near the sphere on the top of the electroscope.
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Function of common elements in a simple circuit. Match the items below with
their correct description. a. | conducting wire | d. | switch | b. | battery | e. | ammeter | c. | lamp (light) | f. | voltmeter | | | | |
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34.
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converts chemical energy into electrical potential energy
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35.
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carries current around a circuit
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36.
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a
device used to measure the amount of current passing through a part of the circuit
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37.
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converts electrical energy into some other form(s) of energy
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38.
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a
device used to measure the potential difference between two points in the circuit.
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39.
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provides a means of interrupting the circuit
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Schematic diagrams: match the diagram to the circuit
element.
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40.
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conducting wire
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41.
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ammeter
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42.
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lamp
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43.
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switch
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44.
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resistor
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Match
the correct item with its description a. | current | d. | power | b. | voltage | e. | percent efficiency | c. | resistance | | | | |
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45.
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potential difference across the load divided by the current through the
load.
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46.
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the
fraction of energy consumed that is used to do useful work.
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47.
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the
number of coulombs of electrons passing a specific point in the circuit each second.
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48.
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the
change in the potential energy of the electrons at one point in the circuit compared to another point
in the circuit.
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49.
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the
amount of energy used in a certain amount of time.
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