10 Chapter review

Question 1

Why does rubbing a balloon on your sweater allow the balloon to stick to a wall or ceiling?

Answer 1

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Question 2

What weather condition helps static charge build up in objects such as clothing? Why?

Answer 2

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Question 3

How can an insulator, like wool, lose electrons to acquire a positive charge?

Answer 3

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Question 4

Why do lines of force point away from a positive charge?

Answer 4

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Question 5

Contrast the movement of charges in insulators & conductors during induction when a charge object is brought NEAR them.

Answer 5

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Question 6

Describe how an electroscope becomes positively charged.

Answer 6

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Question 7

Why do static, or stationary, charges (electrons) move? Describe the duration of their motion.

Answer 7

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Question 8

How can you increase the amount of charge a Leyden jar stores?

Answer 8

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Question 9

When smoke passes through an electrostatic precipitator, the uncharged smoke particles are attracted to the charged plates in the device. What electrical process causes the particles to act this way?

Answer 9

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Question 10

How are electrostatic precipitators an example of dominion science?

Answer 10

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Question 11

List five electrical devices that don’t need to be plugged into an electrical outlet to operate.

Answer 11

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Question 12

How does the flow of electrons in an electrochemical cell differ from that in a PV (photovoltaic) cell?

Answer 12

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Question 13

List three kinds of energy to which electrical energy can be converted.

Answer 13

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Question 14

How much electrical power absorbed in a wire (P = IIR)(i is squared) change if the current triples? How does a wire eliminate the excess energy?

Answer 14

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Question 15

What three devices reduce the likelihood of an electrical fault starting a fire?

Answer 15

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Question 16

How do GFCI outlets protect from electrocutions?

Answer 16

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Question 17

(T or F) Like charges attract, opposite charges repel.

Answer 17

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Question 18

(T or F) In the electric-field model, lines of force start at positive charges and end at negative charges.

Answer 18

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Question 19

(T or F) You can be sure that two objects that electrostatically attract have opposite charges.

Answer 19

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Question 20

(T or F) In a charged electroscope, one of the foil leaves has a positive charge & the other a negative charge.

Answer 20

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Question 21

(T or F) Electrostatic charges build up when electrons are transferred from one object to another.

Answer 21

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Question 22

(T or F) A lightning rod is made from a good insulating material.

Answer 22

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Question 23

(T or F) A capacitor is a modern version of the Leyden jar.

Answer 23

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Question 24

(T or F) Benjamin Franklin assigned the negative charge to the electron.

Answer 24

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Question 25

(T or F) Wet cells can be recharged after they are “dead.”

Answer 25

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Question 26

(T or F) An electrical generator is like a water pump that pumps water to the top of a hill so that it can flow down again.

Answer 26

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Question 27

(T or F) Opening a switch in a parallel branch of a circuit will turn off the entire circuit.

Answer 27

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Question 28

(T or F) The earth can be considered an infinite source or sink of electrons.

Answer 28

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Question 29

A typical flashlight bulb has a resistance of 60 Ohms. If the bulb is used in a 6.0 V flashlight, how much current will it draw?

Answer 29

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Question 30

How much power does the light bulb in the previous question use?

Answer 30

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