Charge, conductors, insulators and semiconductors
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
A balloon rubbed on wool gains a charge of −8 nC. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Ari?
A Van de Graaff dome holds −32 nC of charge. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Esme?
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How well materials conduct electricity (general physics facts)
Material Conducts electricity copper very well aluminum very well silicon in between glass very poorly rubber very poorly Using the table, which two materials would make good wires, Jun?
- Copper and aluminum
- Silicon and glass
- Glass and rubber
Using the table, which material is best for the outer coat of a wire, Kira?
- Copper
- Rubber
- Aluminum
Using the table, which material is a semiconductor, Luz?
- Copper
- Glass, a clear solid
- Silicon
When a balloon is rubbed on wool, what actually moves, Milo?
- Protons, from the balloon to the wool
- Electrons, wool to balloon
- Air, from the wool to the balloon
A positive metal sphere touches a neutral one. How does the neutral sphere become positive, Noah?
- It makes new positive charge
- Protons move onto it
- Some of its electrons leave
A negative Van de Graaff dome is brought near a metal can without touching it. What happens in the can, Pia?
- Electrons jump onto it from the dome
- Its electrons shift away
- Nothing, since they don't touch
Which material is used to make most computer chips, Ren?
- Rubber, an insulator
- Silicon, a semiconductor
- Copper, a conductor
How can engineers change how well silicon conducts, Tala?
- By adding tiny amounts of other elements
- By rubbing it on wool
- By painting it a new color