SSHS PhySci Electricity and Magnetism Review 1

Three lab groups are exploring methods of charging.

Group 1 is charging a plastic comb by rigorously combing a lab member’s hair with it.

Group 2 is charging an insulated metal sphere by bringing a negatively charged metal rod into contact with the sphere, and then breaking contact between the sphere and the rod.

Group 3 is charging an insulated metal sphere by bringing a negatively charged metal rod with a wooden handle near the metal sphere (but not touching), grounding the sphere, and then removing the rod from the lab space.

Which of the following correctly identifies the method of charging for these three groups?

• Group 1 by induction, Group 2 by friction, Group 3 by conduction

• Group 1 by conduction, Group 2 by induction, Group 3 by friction

• Group 1 by friction, Group 2 by induction, Group 3 by conduction

• Group 1 by friction, Group 2 by conduction, Group 3 by induction

Bar 1 is made of glass and has been rubbed with silk. Bar 2 is made of rubber and has been rubbed with fur.

If the bars are held close to one another, why will the hanging bar move toward the held bar?

• The bars have opposite charges.

• The bars have become neutral.

• Both bars have an increase in negatively-charged particles.

• Both bars have an increase in positively-charged particles.

Greg rubbed a balloon vigorously against his hair. Then he held the balloon out toward the wall. The picture shows what happened next.

Which best explains why rubbing the balloon against Greg’s hair made it stick to the wall?

• The gas that kept the balloon inflated made it float until it came in contact with a hard surface.

• Natural oils in his hair transferred to the balloon and gave it a sticky quality.

• The charges between the balloon and the wall were opposite.

• The balloon and the wall were both positively charged.

During a thunderstorm, Charles watched flashes of lightning through his window. Which process best describes the cause of the lightning?

• chemicals from different clouds combining to release energy

• radioactive atoms in the atmosphere exploding between clouds

• heat energy jumping between warmer clouds and colder clouds

• charged particles moving between positively and negatively charged parts of clouds

If bulb 8 burns out, how will the remaining bulbs be affected?

• All the remaining bulbs stay lit.

• Only bulbs 1 through 4 stay lit.

• All the remaining bulbs go out

• Bulb 4 is the only other bulb to go out.

If Bulb 1 burns out, which other bulb(s) will also stop emitting light?

• 2

• 3

• 3 and 4

• 2, 3, and 4

Four significantly different household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because the four appliances

• run on a direct current.

• are connected in series.

• are connected in parallel.

• run on an alternating current.

What is the name of a circuit in which the current splits at the junctions?

• closed circuit

• parallel circuit

• series circuit

• short circuit

A student assembles a series circuit for an investigation. The student uses different resistors and measures the current with each.

The observations indicate which general rule about series circuits?

• The sum of resistance and current is a constant.

• Resistance consumes more energy than current.

• . Current generates more electrons than resistance.

• Resistance and current are inversely proportional.

Which change to a wire would cause its resistance to decrease?

• increase its length

• increase its temperature

• increase its diameter

• increase its resistivity