Charge, conductors, insulators and semiconductors
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
A plastic comb pulled through a wool cloth gains −1.6 nC. With e = 1.602176634 × 10⁻¹⁹ C, about how many billion extra electrons does it carry, to the nearest hundredth, Bo?
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?
Read this first
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?
- Silicon and glass
- Glass and rubber
- Copper and aluminum
Using the table, which material is a semiconductor, Luz?
- Silicon
- Copper
- Glass, a clear solid
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?
- Nothing, since they don't touch
- Its electrons shift away
- Electrons jump onto it from the dome
Which material is used to make most computer chips, Ren?
- Silicon, a semiconductor
- Rubber, an insulator
- Copper, a conductor
How can engineers change how well silicon conducts, Tala?
- By adding tiny amounts of other elements
- By painting it a new color
- By rubbing it on wool
A diode is made from semiconductors. What does it do in a circuit, Zee?
- Lets current flow one way only
- It stores its charge for good, like a battery
- Makes the battery bigger