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?
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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?
- Silicon and glass
- Copper and aluminum
- Glass and rubber
Using the table, which material is best for the outer coat of a wire, Kira?
- Aluminum
- Copper
- Rubber
Using the table, which material is a semiconductor, Luz?
- Glass, a clear solid
- Silicon
- Copper
When a balloon is rubbed on wool, what actually moves, Milo?
- Electrons, wool to balloon
- Air, from the wool to the balloon
- Protons, from the balloon to the wool
A positive metal sphere touches a neutral one. How does the neutral sphere become positive, Noah?
- It makes new positive charge
- Some of its electrons leave
- Protons move onto it
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
How can engineers change how well silicon conducts, Tala?
- By painting it a new color
- By rubbing it on wool
- By adding tiny amounts of other elements
A diode is made from semiconductors. What does it do in a circuit, Zee?
- It stores its charge for good, like a battery
- Lets current flow one way only
- Makes the battery bigger