WorksheetsMultiple Choice - Electric Charges and Fields
Total questions: 99
Worksheet time: 52mins
How charges transfer when object is rubbed
Physically scraping off electrons - friction
Object losing electrons become positively charged and object gaining electrons become negatively charged
Vector nature of electric fields and electrical charges
Electrical field lines have direction and magnitude
Field lines point away from + towards -
Magnetic field lines: away from north towards south
Behavior of electroscope when additional charge is near
Charged object near electroscope causes leaves to move apart - induced charges
If electroscope is grounded while near charged object, it becomes permanently charged
Coulomb's law
Conductors vs insulators
Conductors: electrons can move freely
Insulators: electrons are tightly packed
Conduction, induction, polarization
Conduction: direct transfer of electrons by touch
Induction: rearranging charges without touching
Polarization: shifting electrons within atoms in insulators
Electrical forces
Forces between charged particles can attract or repel
Opposites attract, likes repel
Proton and electron
What is the flow of electrons measured in?
(a)
In which direction do electrons move?
From positive to negative
From negative to positive
Conventional current is from ______ to ______.
(a)
Lightning is caused by charge buildup in clouds and discharge to the ground.
True
False
Lightning doesn’t strike twice in the same place.
True
False
You’ll die from lightning.
True
False
Lightning rods direct charge safely to the ground for protection.
True
False
5 seconds between lightning and thunder equals how many miles?
(a)
In resistors in series, current is the same everywhere (one pathway).
True
False
In resistors in series, voltage drop is directly proportional to (a) .
Sum of voltage drop across all resistors in series equals (a) .
As resistance increases in a series circuit, current (a) .
If a resistor glows in a series circuit, what happens to the current in the entire line?
(a)
Fuses and circuit breakers are connected in series.
True
False
Series wiring is best for individual rooms or section wiring in a house.
True
False
Ammeters are connected in series and have (a) resistance.
In resistors in parallel, current is (a) proportional to resistance.
Sum of current in each branch in a parallel circuit equals (a) .
Total resistance in a parallel circuit is always (a) than any individual resistor.
In a parallel circuit, resistance is the same everywhere.
True
False
In a parallel circuit, voltage drop is the same.
True
False
In a parallel circuit, voltage is equal to current multiplied by (a) resistance.
Voltmeters are connected in parallel and have (a) resistance.
Ammeters connected in parallel will (a) .
If you lose one resistor in a parallel circuit, will the rest still work?
True
False
Adding resistors in parallel will ______ overall resistance and ______ current.
(a)
Parallel wiring is best suited for (a) -house wiring.
What is the electrical potential difference called?
(a)
Voltage is measured in (a) .
What pushes current through a circuit?
(a)
What is the formula for electrical power?
(a)
What is the formula for electrical energy?
(a)
What are charged atoms called?
(a)
Cations are ions with what type of charge?
(a)
Anions are ions with what type of charge?
(a)
What is Ohm's Law?
(a)
Magnetic fields are caused by:
Stationary charges
Moving charges
Heat
Light
Magnetic fields go from _______ to _______.
(a)
Motors convert _______ energy into _______ energy.
(a)
Generators convert _______ energy into _______ energy.
(a)
Transformers use (a) induction to change voltage.
In a step up transformer, voltage _______ and in a step down transformer, voltage _______.
(a)
Power changes in a transformer.
True
False
If voltage increases in a transformer, what happens to the current?
(a)
Moving charges create (a) fields.
Changing a magnetic field can induce (a) .
How do Earth's magnetic fields come about?
(a)
What is the highest part of a wave called?
(a)
What is the lowest part of a wave called?
(a)
What term describes the height from the rest position in a wave?
(a)
What is the distance from crest to crest in a wave called?
(a)
What is the time for one cycle of a wave called?
(a)
What is the number of cycles per second in a wave called?
(a)
Standing waves are created by interference of two identical waves moving in (a) directions.
In standing waves, what is the point of no motion called?
(a)
In standing waves, what is the point of maximum motion called?
(a)
What is the relationship between frequency and wavelength?
(a)
Constructive interference occurs when waves are in phase and in the same place at the same time. What happens to the amplitude?
(a)
Destructive interference occurs when waves are out-of-phase and in the same place at the same time. What happens to the amplitude?
(a)
What determines the speed of waves?
(a)
Does sound travel faster in solids or gases?
(a)
What is the speed in a given direction called?
(a)
What is the maximum displacement from equilibrium called?
(a)
What is the time for one cycle to occur called?
(a)
What is the distance between any two successive parts of a wave called?
(a)
What happens when force vibrations match natural frequencies?
(a)
When you match natural frequency, what happens to the amplitude?
(a)
What kind of waves can be polarized, and why?
(a)
What does it mean if something is polarized?
(a)
Loudness of sound waves is measured in (a) .
Which of the following is NOT a primary color of light?
Red
Blue
Green
Yellow
Combine all primary colors of light to make (a) .
Combine all primary colors of pigment to make (a) .
What are the primary colors of pigment?
(a)
An object appears a certain color based on what it _______ and what it _______.
(a)
What is the photoelectric effect?
(a)
Which type of electromagnetic wave has the lowest energy/longest wavelength?
Gamma Rays
X-Rays
Radio Waves
Ultraviolet
Shorter wavelength = _______ frequency = _______ energy.
(a)
Why is the sky blue?
(a)
Why are sunsets red?
(a)
Why is snow white?
(a)
Color by addition involves:
light
pigments
Color by subtraction involves:
light
pigments
State the Law of Conservation of Energy.
(a)
What is a transparent material?
(a)
What is a translucent material?
(a)
What is an opaque material?
(a)
Explain the Motor Effect in a linear motor or generator.
(a)
Explain the Generator Effect in a linear motor or generator.
(a)
Describe what happens to frequency as you move closer in the Doppler Effect.
(a)
Describe what happens to frequency as you move further in the Doppler Effect.
(a)
Car A is moving at 30 m/s and car B is moving at 20 m/s. What is the perceived frequency by car B (observer) of Car A’s (source) 1000 Hz horn if Car A is in front of car B going in the same direction?
1000( 344.2−(−30)344.2+20 )
