Which of the following is an accurate statement?

a. step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming voltage to a higher voltage.
b. ac generators produce current that is pulsating, but always remains positive.
c. dc generators produce current with a voltage that changes from positive to negative.
d. step-up voltage transformers have a lower number of turns in the primary than in the secondary winding.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.