Unit 3 - Electricity Flashcards Preview

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Flashcards in Unit 3 - Electricity Deck (22):
1

If there is more protons than electrons, is the object negative?

No, it is positive

2

Unit for measuring resistance

Ohm

3

Charging without contact

Induction

4

Another name for voltage

Electric Potential

5

Negatively charged particle

Electron

6

Unit for measuring power

Watt

7

What are 3 renewable energy generation methods used in Canada?

Biogas, tidal, geothermal, wind, solar, hydroelectricity

8

What are 3 non-renewable energy generation methods in Canada?

Nuclear energy, fossil fuels, coal (not ontario), nuclear, natural gas

9

What is a generator and how does it generate electricity using wind?

A machine that creates moving (mechanical) energy into electrical energy. Turns a turbine that spins a copper coil into a magnetic field.

10

Using the laws of electrostatics, solve the following puzzle:
Ball A attracts balls C and D
Ball C and D repel each other
Ball B is attracted to all of the balls
(4 pith balls are suspended from an insulated wire)

A:+ B:n C:- D:-

11

A balloon is charged by friction using a piece of wool. Using the electrostatic series, identify the charges that develop on the balloon and wool.

Balloon-Negative
Wool-Positive

12

What is the formula for voltage?

V=IR

13

What goes on a voltage vs. current graph on the y axis?

Voltage

14

What does the slope represent on a voltage vs. current graph?

Resistance

15

If you were to shuffle your feet across a rug explain what would happen and why.

Charge by friction, cotton=negative (stronger hold on electrons), wool socks=positive (weaker hold on electrons)

16

True or false: Any time you touch an object you ground it.

True

17

True or false: During induced charge separation the object is charged permanently.

False (temporarily)

18

True or false: An electroscope indicates whether an object is neutrally charged.

True

19

Conductors, such as metals allow electrons to move freely.

True

20

During charging by contact the neutral object gains the opposite charge as the charged object.

False (same)

21

Explain the process of how lightning forms and how it hits the ground.

-Water + ice crystals collide charging each other by friction
-Charge separation builds up in clouds (+ on top - on bottom)
-Excess electrons repel electrons at Earth's surface
-Electrons from clouds are transferred to the ground

22

Describe how a positively charged object could cause a neutrally charged object to become charged permanently.

Electrons leave neutrally charged object and come to positively charged object. Makes both P and N positive.