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EE Ch 10-18 Comp

Exploration Education Q2 Comp Review

QuestionAnswer
A magnet that is made by using an electric current is called … electromagnet
Which best describes what a magnet is A substance that has an invisible magnetic force, a north and south pole, and attracts certain metals
Rare earth magnets are not as strong as lodestones FALSE
Magnets are used in the medical field in machines referred to as MRI’s TRUE
An armature, brushes, and fixed magnets are all part of motor
Compasses are a relatively new technology that have been instrumental in navigation FALSE
A generator uses electromagnets to turn electricity into motion FALSE
Which of the following is true about motors Motors are used throughout our day
If you reverse the polarity of a magnet on a DC motor, it will reverse the direction of the motor TRUE
Which of the following is true Generators are very similar to motors in their design
One obstacle of sending humans to Mars is that the prolonged weightlessness causes loss in bone density TRUE
Which best describes why the earth has seasons Because of the tilt of the earth
One astronomical unit (AU) is equal to how far the earth is from the moon FALSE
Which best describes what Kepler’s first law of planetary motion is All planets move around the sun in an ellipse
One light year is the distance light would travel in one year TRUE
An atom is made up of electrons, protons, and photons FALSE
What is a hydroelectric plant An energy plant that uses water in producing electricity
Which best describes what a resistor (in terms of electricity) is A resistor restricts the flow of electricity through it
Static electricity is a force that is created when objects lose or gain electrons TRUE
Which statement is true An insulator is a substance that electrons cannot pass through easily
Referring to electrical charges, opposites repel, likes attract FALSE
If two 1.5 volt batteries are lined up in series, the overall voltage will be 3 volts TRUE
Which of the following best describes what an electrical switch is A switch is a device that can open or close a circuit
Electricity is a form of energy involving negative and neutrally charged particles FALSE
Which best describes what an atom is An atom consists of a nucleus (neutrons and protons) and electrons
Electrical engineering is the branch of engineering that studies the science of electricity but is not applied FALSE
Which best describes what an ion is When an atom or molecule has a positive or negative charge
Alternating current is when the electrons in a circuit first flow in one direction, then reverse and flow the other direction TRUE
What is Ohm’s Law Ohm's law states that the voltage of a circuit is equal to the current times the resistance
Induction is the process where a neutral object gets a static charge from a charged object bumping against it FALSE
Created by: nolahomers
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