MSI chapter 20

A material has a net electric charge because it

• discharges

• has alternating current

• has an excess or shortage of electrons

• has a direct current

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Static electricity is the study of

• buildup of charge

• electric discharges

• electric fields

A strong electric field is

• directed toward a charge

• directed away from a charge

• caused by a large quantity of charge

• caused by a small quantity of charge

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What is a material called that easily carries a current?

A superconducting material

• requires very high current

• has no resistance at room temperature

• has no resistance at low temperatures

• has high resistance at low temperatures

What does Ohm's law state?

• current equals voltage times resistance

• voltage equals resistance divided by current

• voltage equals current divided by resistance

• voltage equals current times resistance

Which melts to protect a circuit?

• three-prong plug

• wiring

• diode

• fuse

What does "I" represent in the equation P = I x V?

• voltage

• resistance

• current

• kilowatts

The output of a diode can be

• direct current

• a superconductor

• resistance

• alternating current

Three layers of semiconductor material can form

• a transistor only

• a diode only

• either a transistor or a diode

• neither a transistor nor a diode

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NGSS.HS-PS2-5

NGSS.HS-PS3-5