What is the meaning of the term \"resistance\" as applied toelectricity? Resista

Question

What is the meaning of the term "resistance" as applied toelectricity? Resistance is a measure of a material's oppositionto
      voltage.
          movement of protons.
       current.
       electricforce.


How does an electron acquire a negative charge?
       From an imbalance ofsubatomic particles.
       By induction or contactwith charged objects.
       From the friction ofcertain objects rubbing together.
           Charge is a fundamental property of anelectron.


. Which of the following is a measure ofelectrical work?
       kW
       C
           kWh
       C/s


. Which choice below pairs a scientific termwith the correct scientific unit?
       work:newton
       power:joule
            force:joule
       power:watt


Why do astronauts in orbit around Earth see a black sky withstars that do not twinkle but see a blue Earth?
       They are too far from theSun, which makes the sky black, but are relatively close toEarth.
       Earth has an atmosphere,which scatters blue light; the sky where they are doesnot.
            Light is absorbed by space, but reflected fromEarth.
       Light from stars in spaceis not reflected, so stars do not twinkle and the sky isblack.


The kinetic energy of a moving object can be measured interms of
       how much work was doneputting the object into motion.
       How much work is neededto bring the object to a stop.
       1/2mv2.
           Any of the above.

Explanation / Answer

1. Resistance is the equivalent of friction and is the material'sopposition to current 2. An electron in negative because charge is a fundamental propertyof electrons 3.Kilowatt-hours is a measure of electrical work 4. Power is measured in Watts, hence this relationship is the onlytrue one present 5.Astronauts do not see the glow from stars while in space becausethere is no medium for the light to reflect and therefore it is notnoticeable. However, the Earth is a medium which can reflect lightand make it noticeable from space 6.Kinetic energy can be measured using all of the above,.5mv2 how much work is needed to retard motion and howmuch energy was transferred into motion

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