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100
__________ is a good conductor for a closed circuit. a) Plastic b) Rubber c) Copper d) Wood
What is: c) Copper
100
A compass needle points in a north-south direction because it reacts to Earth's ___________ ________. a) spinning orbit b) weather changes c) magnetic poles d) magnetic forces
What is c) magnetic poles
100
A material that conducts electric current poorly is called: a) a conductor b) an insulator c) a closed circuit d) an open circuit
What is b) an insulator
100
___________ particles will gather near the bottom of a cloud prior to releasing energy as lightning. a) Heavy b) Scattered c) Cold d) Negative
What is d) Negative
100
In a doorbell. electromagnets help convert ___________ energy to __________ energy to ___________ energy. a) mechanical, magnetic, electric b) magnetic, electric, mechanical c) electric, magnetic, mechanical d) electric, mechanical, magnetic
What is c) electric, magnetic, mechanical <--- ABC order!!
200
T/F:The strength of an electromagnet can be decreased by using more turns in the metal coil.
What is: False: increased with more coils, not decreased.
200
T/F: Static energy is produced when a coiled wire is spun around a magnet.
What is: False: Electrical energy, not static
200
T/F: A positively charged object attracts a positively charged object.
What is: False - a positively charge object repels another positively charged object
200
T/F: Positive particles will gather near the bottom of a cloud prior to releasing energy as lightning.
What is: False - negative particles do this
200
T/F: A magnetic field is strongest at both poles.
What is: true
300
A compass needle points in a ______-______ direction because it reacts to Earth's magnetic poles.
What is: north-south
300
_________ electricity is caused by an imbalance of positive and negative charges.
What is: Static
300
Where is a magnetic field the strongest?
What is: Near the north pole and near the south pole
300
The strength of an electromagnet can be decreased by:
What is: fewer/less coils and/or a smaller core
300
___________ energy is produced when a coiled wire is spun around a magnet.
What is: electrical
400
Explain what happens in a series circuit when a light goes out?
What is: The rest of the lights will go out too because there is only one path for the electric current to flow.
400
Explain what would happen if a light goes out in a parallel circuit.
What is: The rest of the lights would remain unaffected because in a parallel circuit there are two pathways for an electric current to flow.
400
Explain what would happen to the magnetic poles if a magnet was broken into two parts.
What is: When a magnet is broken into two pieces, each magnet will still have its own north-seeking and south-seeking poles. <--- This means that the magnet that is broken into two pieces still has a north pole and a south pole. The broken places in the middle will still seek (or be attracted to) either the north pole or the south pole.
400
Explain which kind of circuit - series or parallel - would be best for a house.
What is: A parallel circuit would be best for a house because parallel circuits can handle appliances that use different amounts of electric current. Also, other appliances on the circuit continue to run in one stops working.
400
HOW do generators create electricity?
What is: A generator uses mechanical energy to turn coils of wire around powerful magnets. This creates electrical energy.