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WorksheetsEM Unit Test Study Guide
Total questions: 90
Worksheet time: 1hrs 24mins
Materials such as steel that electric current flow through them easily are called (a) .
exerts a force on other magnets and objects made of magnetic material (strongest closed to magnet)
(a)
strength of force between 2 magnets depends on the (a) between them
Series or Parallel Circuit?
(a)
Series or Parallel Circuit?
(a)
all materials have some electrical resistance measured in (a) ?
A wire which is carrying a current is surrounded by (a)
a device that changes the voltage of an alternating current with little loss of energy
(a)
reverses the direction of the current flow in regular patters. (Ex. plugging toaster into wall outlet)
(a)
A current where the electrons flow in 1 direction
(a)
A current carrying wire wrapped around an iron core
(a)
A compass points to the (a) .
This surrounds a magnet
(a)
In a battery what kind of reaction provides the electrical charge?
(a)
The two basic types of circuits are (a)
The rate at which electrical energy is converted into other forms of energy
(a)
A circuit which has more than one pathway for the electric current to follow
(a)
A circuit which has only one pathway for the electric current to flow
(a)
Measure of how much electrical potential energy each electron can gain
(a)
A closed conducting loop
(a)
Flow of electric charge
(a)
A material in which electrons do not move easily
(a)
Contain electrons that can move more easily in material.
(a)
A charged atom
(a)
Lighting is caused by (a) electricity.
(a) are substances that allow electricity to pass easily through them.
(a) electricity is the result of an imbalance between negative and positive charges in an object.
The diagram below represents the interaction of two objects.
What can be the electric charges of object A and object B?
a. Object A is positive; Object B is positive
b. Object A is negative; Object B is negative
C. Object A is positive; object B is negative
d. Object A is neutral; object B is neutral.
(a)
Materials such as wood that electric current cannot flowthrough the easily are called (a)
All conductors conduct electricity equally well.
True
False
Insulators are important to protect us from getting electrocuted.
True
False
Electrons can move easily in metals, so metals are usually good insulators.
True
False
Conductor or Insulator?
Gold
(a)
Conductor or Insulator?
Glass
(a)
Conductor or Insulator?
Plastic
(a)
Explain what happened?
Conductor or Insulator?
Copper
(a)
Which of the following is not an example of an insulator?
Porcelain
Rubber
Sea Water
Paper
Which of the following is NOT an example of a conductor?
Paper Clips
Pennies
Bolts
Erasers
Electricity is a form of energy
True
False
Atoms contain particles called electrons, protons, and neutrons.
True
False
A negatively charged atom has more protons than electrons.
True
False
(other way)
Like charges attract each other; unlike charges repel each other.
True
False
(other way)
Electricity is the movement of electrons between atoms.
True
False
The word static means moving.
True
False
Which of the following objects is electrically neutral?
a
b
c
d
Which of the following particles has a positive charge?
a. Protons
b. neutron
c. electron
(a)
An object becomes charged when it loses or gains (a) ?
When an object has more electrons than protons, it is (a) charged.
What will occur when the 2 spheres shown here come in contact with each other?
a. electrons will move from the red sphere to the blue sphere.
b. electrons will move from the blue sphere to the red sphere.
c. protons will move from the red sphere to the blue sphere.
d. protons will move from the blue sphere to the red sphere.
(a)
Which of the following atoms is considered negative?
a. an atoms with 7 protons, 7 neutrons, and 7 electrons
b. an atom with 7 protons, 7 neutrons, and 8 electrons
c. an atom with 8 protons, 7 neutrons, and 7 electrons
d. an atom with 7 protons, 8 neutrons, and 7electrons
(a)
Which of the following methods are ways to charge and object?
a. friction
b. conduction (direct contact)
c. induction
d. all of the above
(a)
Which of the following subatomic particle are located outside of the nucleus?
a. neutron
b. electron
c. proton
(a)
When neutral rubber rod and neutral wool are rubbed together, electrons on the wool are transferred to the rubber rod, and the rubber rod is charged (a) .
(a) electricity is the flow of electrons through a conductor.
a. induction
b. current
c. static
d. insulator
Consider 4 charged objects, X, Y and Z.. and T.
- Object X repels Object Y
- Object Y attracts Object Z
- Object Z attracts Object T, which is positively charged
Which objects are negatively charged??
Object X and Object Y
Object Y and Z
Only Object Y
Only Object Z
After being rubbed through the hair, a plastic comb can attract small pieces of paper.
This charging method is called charging by (a) ?
Imbalance of electric charge on an object
(a)
Because wind turbines produce electricity, what can we infer is part of a wind turbine?
a. solar cells
b. magnets
c. magnesium
d. voltmeter
(a)
A scientist wants to produce a large magnetic field. Which of the following best describes what the scientist needs?
a. 5 grams of magnetite
b. copper wire
c. an iron core wrapped with a copper coil
d. a large piece of iron
(a)
Which answer best describes how electricity can be produced with minimum pollution?
a. burning of coal to produce steam to turn a turbine
b. burning of oil to produce steam to turn a turbine
c. use of a wind turbine
d. the use of propane to power a generator
(a)
Windmills are sources of renewable energy.
What device transforms the mechanical energy into electrical energy?
a. an engine
b. a solar cell
c. the paddle
d. a turbine
(a)
choose between a solar panel and a wind turbine. Which is a more efficient supplier of electricity, why?
(a)
when electric current flows through a wire, a _______ ________forms around the wire
(a)
Write how this electromagnet could be stronger?
(a)
Explain how a generator produces electricity.
(a)
a device that changes electrical energy into mechanical energy
(a)
Compare and Contrast how electricity is made from wind turbines vs. coal powered turbines.
(a)
(a) : accumulation of excess electric charges on an object
atoms become charged by gaining or losing electrons
opposite charges (a)
like charges (a)
This is the ____ __ _______ __ ____.
electric charges can be transferred from object; but it cannot be created or destroyed.
(a)
Wood, plastics, rubber are examples of (a)
metals are examples of (a)
This is charging by (a) ?
Process of transferring charge by touching or rubbing
This is charging by (a) ?
rearrangement by electrons on a neutral object caused by nearby charged objects
The net movement of electric charges in a single direction through a wire or conductors is _________ _______.
(a)
a (a) is a closed path that electric current flows
force that causes electric charges to flow; charges flow from high voltage to low voltage.
(a)
(a) law: current in a circuit equal voltage difference divided by resistance.
tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy.
(a)
contains 2 connected plates made of different metals in conducting a solution.
ex. car battery
wet cell
dry cell
chemical reactions occur in a moist paste causing transfer of electrons.
wet cell
dry cell
current in a circuit equals voltage difference divided by resistance
(a)
making wires_______increases resitance
thinner
longer
hotter
Label #1 on the simple circuit
(a)
Label #2 on the simple circuit
(a)
Label #3 on the circuit
(a)
Label #4 on the circuit
(a)
refers to the properties and interactions of magnets in which there is a force of attraction or repulsion between like or unlike poles
(a)
