Science Test Study Set

What can you infer about this source of electricity? (Wall outlet) A. It is a source of alternating current B. it is a source of direct current C. It is a source of static electricity D. It is a source of electricity

A. It is a source of alternating current

What can you infer about any object that give you a static shock when you touch it? A. It's a conductor B. It's an insulator C. It's negatively charged D. It's positively charged

A. It's a conductor

What causes lightning? A. A similarity in electrical charge B. Electrons flowing through a conductor C. A different in electrical charge D. Raindrops conducting electricity from clouds to the ground

C. A different in electrical charge

What happens when electricity flows through an object? A. A magnetic field is destroyed B. Protons are pulled away from their atoms C. A magnetic field is created D. Electrical charge is equalized

C. A magnetic field is created

What is static electricity caused by? A. A balance of power B. A balance of positive and negative charges C. An imbalance of positive and negative charges D. An imbalance of protons and neutrons

C. An imbalance of positive and negative charges

How does electricity travel from power plants to your house? A. It travels through the air as electromagnetic waves B. Through heat energy into electrical energy C. Changing mechanical energy into electrical energy D. Changing solar energy into electrical energy

C. Changing mechanical energy into electrical energy

What is the function of every generator on Earth? A. Changing wind energy into electrical energy B. Changing heat energy into electrical energy C. Changing mechanical energy into electrical energy D. Changing solar energy into electrical energy

C. Changing mechanical energy into electrical energy

Which material has a low electric resistance? A. Glass B. Plastic C. Copper

C. Copper

A complete path through which a current travels

Electric circuit

A measure of how difficult it is for an electric current to flow through material

Electric resistance

What is a common energy source for a circuit? A. A battery B. A bulb C. A wire D. An appliance

A. A battery

What is a current? A. A steady flow of electricity B. A short burst of electricity C. A wire along which electricity flows D. A power source that supplies electricity

A. A steady flow of electricity

Which device opens and closes an electric circuit? A. A switch B. A power source C. A load D. A current

A. A switch

Place the following events in sequence: A) Voltage is increased by a transformer; B) Voltage is decreased by a transformer; C) Electrical current enters your home A. A, B, C B. B, A, C C. A, C, B D. B, C, A

A. A, B, C

Which of the following atoms is considered neutral? A. An atom with five protons, six neutrons, and five electrons B. An atom with five protons, five neutrons, and six electrons C. An atom with six protons, five neutrons, and five electrons D. An atom with six protons, six neutrons, and five electrons

A. An atom with five protons, six neutrons, and five electrons

How does a generator create current? A. By using an electromagnet B. By using an internal combustion engine C. By using a fan D. By using energy from the sun

A. By using an electromagnet

What causes the shock you receive when you touch a doorknob? A. Electrons being pulled from one surface to another B. Protons being pulled from one surface to another C. Neutrons being pulled from one surface to another D. Positrons being pulled from one surface to another

A. Electrons being pulled from one surface to another

What is one possible reason why it's a good idea to conserve electricity? A. It is often produced by burning fossil fuels, which are a polluting, non-renewable resource B. Power companies only give each home a limited amount of electricity every day C. Using too much electricity can start dangerous electrical fires D. Using too much electricity can cause power plants to break down

A. It is often produced by burning fossil fuels, which are a polluting, non-renewable resource

In most electrons circuits, the pathway is made of: A. Metal B. Plastic C. Static D. Wood

A. Metal

What are electrons? A. Negatively charged subatomic particles B. Positively charged subatomic particles C. Neutrally-charged subatomic particles D. Negatively charged atoms

A. Negatively charged subatomic particles

Which equation correctly states Ohm's law? A. Voltage=current x resistance (V = I x R) B. Voltage=current + resistance (V=I + R) C. Voltage=current/resistance (V=I/R)

A. Voltage=current x resistance (V = I x R)

If a substance has an excess number of electrons on its surface, what type of charge does it have? A. A positive charge B. A negative charge C. A neutral charge D. A nuclear charge

B. A negative charge

Why static electricity not useful as a power source? A. Because electrons aren't transferred in bursts of static electricity B. Because all energy is released at once in static electricity C. Because static electricity is not real form of electricity D. Because static electricity only occurs in lightning

B. Because all energy is released at once in static electricity

What are the three components of a circuit? A. Pathway, source, and battery B. Energy source, conductor, and receiver C. Battery, bulb, and plastic D. Wire, electron, and charge

B. Energy source, conductor, and receiver

Which action would increase the resistance of a copper wire? A. Making it shorter B. Making it thicker C. Making it thinner

B. Making it thicker

What happens when you touch a metal door knob after rubbing your shoes on the carpet? A. The doorknob sends a burst of electric current into your body B. Millions of electrons go from your finger into the doorknob C. The door knob sends millions of electrons in your finger D. Your finger becomes negatively charged

B. Millions of electrons go from your finger into the doorknob

How are electrons different from protons and neutrons? A. protons and neutrons are negatively charged; electrons are positively charged B. Protons and neutrons exist inside atomic nuclei; electrons orbit atomic nuclei C. Electrons exist inside atomic nuclei; protons and neutrons orbit atomic nuclei D. Protons and neutrons are positively charged; electrons have no charge

B. Protons and neutrons exist inside atomic nuclei; electrons orbit atomic nuclei

The ohm is a unit used to measure A. Current B. Resistance C. Number of electrons

B. Resistance

What is the main function of a turbine? A. Producing a magnetic field B. Spinning C. Reducing the voltage of an electrical current D. Increasing the voltage of an electrical current

B. Spinning

What happens if you disconnect a circuit from its positive terminal? A. The electrons shoot out from the negative terminal B. The electrons stop flowing, and the current stops C. The current reverses direction D. Nothing happens

B. The electrons stop flowing, and the current stops

What do fuel cells, batteries, and solar cells have in common? A. They all produce static electricity B. They are all sources of direct current C. They are all sources of alternating current D. They can all be sued to power automobiles

B. They are all sources of direct current

What does lightning have in common with the shock you receive when you touch a doorknob A. They both involve protons being pulled away from atoms B. They're both forms of static electricity C. They're both forms of current electricity D. Neither of them has anything to do with electricity

B. They're both forms of static electricity

What might happen if wires weren't insulated? A. The power source would no longer provide a flow of electrons B. We'd be in danger of harm from electric shocks C. Current electricity would become static electricity D. The current would be broken

B. We'd be in danger of harm from electric shocks

Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground? A. Protons and neutrons are transferred from the clouds to the ground B. The ground becomes negatively charged C. Electrons are transferred from the clouds to the ground D. An electric current is established between the clouds and the ground

C. Electrons are transferred from the clouds to the ground

Which term refers to an electric circuit with more than one path, or branch, for electric current to follow? A. Electrical device B. Fuse C. Parallel circuit D. Series circuit

C. Parallel circuit

How does rubber differ from most metals? A. Rubber is a good conductor, most metals are good insulators B. Rubber conducts electrons; most metals conduct protons C. Rubber is a good insulator; most metal are good conductors D. Rubber is a good power source; most metals are good conductors

C. Rubber is a good insulator; most metal are good conductors

Which word best describes electricity as it occurs in nature? A. Orderly B. Stationary C. Sudden D. Powerless

C. Sudden

Which of these materials is an insulator? A. Foil B. Wire C. Sweater D. Penny

C. Sweater

A flow of electrons through a conductor is called: A. A river B. A spark C. An electron flow D. A current

D. A current

Which is an example of an energy source? A. Wire B. Device C. Circuit D. Battery

D. Battery

What is the major different between static electricity and current electricity? A. Current electricity involves a continuous flow of neutrons; static electricity is a sudden transfer of protons B. Current electricity can be deadly; static electricity is almost always safe C. In current electricity, there's a single transfer of electrons; in static electricity, there's a steady flow of electrons D. Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons

D. Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons

How does alternating current differ from direct current? A. Alternating current produces more voltage than direct current B. Alternating current always flows in the same direction; the direction of a direct current switches back and forth C. Direct current produces more voltage than alternating current D. Direct current always flows in the same direction; the direction of an alternating current switches back and forth

D. Direct current always flows in the same direction; the direction of an alternating current switches back and forth

What is the function of a power source in a circuit? A. It provides a steady source of static electricity B. It provides a mean through which the circuit can be broken C. It provides a path along which the electricity can flow D. It provides a steady flow of electrons

D. It provides a steady flow of electrons

What role does adhesion play in static charge? A. It causes atomic nuclei to become unstable B. It makes sure that atoms stay neutrally charged C. It prevents certain material from giving away electrons D. It pulls electrons from one surface toward another

D. It pulls electrons from one surface toward another

Electric energy enters your home through which of these? A. Circuit breaker B. Electric meter C. Fuse D. Main wire

D. Main wire

What are the two poles of a magnet called? A. Up and down B. East and west C. Left and right D. North and south

D. North and south

In the following diagram, the light bulb is: A. The pathway B. The energy source C. The conductor D. The energy receiver

D. The energy receiver

Which of the following is an example of a load? A. Power outlet B. Battery C. Wire D. Toaster

D. Toaster

Which of the following are sources of mechanical energy? A. Cars and trucks B. Radios and televisions C. Transmission lines and transformers D. Wind and fossil fuels

D. Wind and fossil fuels

A measure of the amount of energy used to move 1 coulomb of electrons

Voltage