Physical Science B_ Module 4

What kind of material has a large number of atoms with aligned magnetic fields?

• Conductor

• Insulator

• Superconductor

• Magnetic domain

What is the potential difference also known as?

• Current

• Voltage

• Resistance

• Power

How is electrical energy typically generated in power plants?

• By converting mechanical energy to electrical energy

• By chemical reactions

• By using batteries

• By using solar cells

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What is the SI unit of electric current?

• Ohm

• Coulomb

• Ampere

• Volt

Which component is used to amplify a signal in electronic devices?

• Resistor

• Transistor

• Capacitor

• Diode

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What is an example of an analog signal?

• Digital TV signal

• Computer data

• CD audio

• Human voice in air

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Which material is an example of an electrical insulator?

• Water

• Silver

• Copper

• Plastic

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What kind of signal is represented by smoothly varying waveforms?

• Digital signal

• Analog signal

• Both analog and digital signals

• Neither analog nor digital signals

What is the force between two charged bodies directly proportional to?

• The product of their charges

• The difference of their charges

• The square of the distance between them

• The sum of their charges

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What is the primary source of electrical energy for most homes and businesses?

• Batteries

• Generators at power plants

• Solar cells

• Transformer