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 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?
- Glass and rubber
- Copper and aluminum
- Silicon and glass
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
- Copper
- Silicon
A positive metal sphere touches a neutral one. How does the neutral sphere become positive, Noah?
- Protons move onto it
- Some of its electrons leave
- It makes new positive charge
A negative Van de Graaff dome is brought near a metal can without touching it. What happens in the can, Pia?
- Its electrons shift away
- Electrons jump onto it from the dome
- Nothing, since they don't touch
How can engineers change how well silicon conducts, Tala?
- By rubbing it on wool
- By adding tiny amounts of other elements
- By painting it a new color
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