Why do electricians always wrap wires in plastic?

• Plastic comes in many different colors

• Plastic is a good electrical conductor

• Plastic makes the wires easy to bend

• Plastic is a good electrical insulator

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A science class was completing an experiment on electrical circuits. Why did the bulb go out each time the switch was opened?

• Opening the switch broke the circuit

• The battery was probably going flat

• There was too much electricity flowing

• Opening the switch closed the circuit

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Which would make the strongest electromagnet?

• A battery with 4 wire coils around a nail

• A battery with 6 wire coils around a nail

• A battery with 10 wire coils around a nail

• A battery with 8 wire coils around a nail

The space around a magnet where the force of the magnet can act is called-

• static electricity

• lightning

• a magnetic field

• resistance

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Lightning is an example of _________.

• static electricity
• current electricity
• watts
• voltage

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Thicker wires have _______ resistance than thinner wires.

• more
• less
• the same

As the resistance in a circuit increases, the electric current __________.

• increases
• decreases
• stays the same

Which type of current comes from a battery?

• alternating current (AC)
• direct current (DC)

What type of wave behavior is pictured above?

• Refraction
• Reflection
• Absorption
• Diffraction

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What type of wave behavior is pictured above?

• Refraction
• Reflection
• Absorption
• Diffraction

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