Answers:1.51 Magic Square

1.52 MAGIC SQUARE

Decode, (unscramble) the words.

(If you need help: there is a list of all the words decoded on the next page above the magic square. The first letter of each word is underlined)

M ___________ lmtesa

L ___________ rtsihgnebs

C ___________ iomgvn manegt

F ___________ yetlcroltee

K ___________ ilhtg

N ___________ on

E ___________ fditferen

D ___________ lmccheia

B ___________ pcosams nleeed

G ___________ tpoielsiyv

P ___________ theruocoplme

I ____________ erbaytt

H ___________ gneaelytiv

A ___________ gtnmae

J ___________ oitoselypp dcrghae

O ___________ oerm

Match the letter of the decoded words with the words in the table below.

____2 metals

____3 brightness

____4 moving magnet

____5 electrolyte

____6 light

____7 no

____8 different

____9 chemical

____10 compass needle

____11 positively

____12 thermocouple

____13 battery

____15 negatively

_A_16 magnet

____17 oppositely charged

____18 more

Fill in the numbers for the magic square

1.60 Sources of Electric Current In the Real World

Electric energy in the real world comes from the following:

.61 Dry cells (everyday world) pp142-148

 

Ordinary Cell

(Leclanché)

Alkaline Cell

Mercury Cell

 

(not drawn to scale)

()

These are closer to actual sizes

Size

     

Use

     

Recharge ?

     

Current*

     

Lifetime *

     

*Lifetime of Cells Compared

The Guts and the Glory

Label the following from the choices at the right

KIND OF CELL

LABELED PARTS

CHOICES

Ordinary Cell

 

insulator

zinc

(-) electrode

ammonium chloride

manganese (IV) oxide

(+) electrode

carbon connector rod (+) electrode

 

Alkaline cell

 

 

insulator

manganese (IV) oxide

magnesium or zinc

potassium hydroxide

metal cover for (+) electrode

metal cover for (-)electrode

     

KIND OF CELL

LABELED PARTS

CHOICES

 

.62 Cell Summary

Fill in the summary chart from the pictures and reading pp 142-147

Cell Type

(+)electrode

(-)electrode

Electrolyte

Ordinary cell

(Leclanché)

 

 

 

 

 

 

 

Alkaline

 

 

 

 

 

 

 

Mercury

 

 

 

 

 

 

Lithium

     

 

Lead Storage

     

 

Nickel-Cadmium

     

 

 

 

Answers : .62 Cell Summary

 

Cell Type

+ electrode

- electrode

Electrolyte

Ordinary cell

(Leclanché)

 

manganese (IV) oxide

 

Zinc

metal

 

Ammonium chloride paste

Alkaline

 

manganese (IV) oxide

 

Magnesium with Zinc particles

 

Potassium hydroxide

Mercury

 

Mercury (II) oxide

 

Zinc

 

Potassium hydroxide

Lithium

 

Lithium

 

Iodine

 

poly 2-vinyl pyridine

 

Lead Storage

 

Lead(IV) oxide

 

Spongy Lead

 

Sulphuric Acid

Nickel-Cadmium

 

Nickel

oxide (hydroxide)

 

Cadmium metal

 

Potassium hydroxide

.63 Comparing 12V Batteries

Complete the Summary Sheet from your notes and the reading and pictures pp142-148

Chart Comparing 12V Batteries

 

 

 

Leclanché

or

Alkaline

Lead Storage

&

Ni Cad

Number of electrode pairs or cells/battery

 

 

 

 

 

 

Size of

electrodes

 

 

 

 

 

 

Power and Current

 

 

 

 

 

Use/Utility

 

 

 

 

 

 

Recharge?

 

 

 

 

Size

 

 

 

 

 

 

Answers: .63 Comparing 12V Batteries

 

 

 

Leclanché

or

Alkaline

Lead Storage

&

Ni Cad

Number of electrode pairs or cells/battery

 

8

 

 

6

Size of

electrodes

 

relatively small

 

relatively large

(Ni Cad smaller, higher cost)

Power and Current

 

Low power and current

 

High power and current

Use/Utility

 

Light, General utility

toys/lights

 

 

Heavy, Industrial utility

Bulldozer /truck starter

Recharge?

 

Not rechargable

 

Rechargable

(Ni Cad lasts longer)

 

Size

 

compact

 

large &bulky

(Ni Cad smaller)

 

 

 

.64B

"Makita", NiCad Advertisement

Cordless Drills

Cordless drills allow you to go anywhere without extension cords. These versatile tools may be used in most drilling/driving applications with tremendous results and user satisfaction.

This graph was found in a Makita advertisement:

Makita batteries deliver

consistent power

[1] Which graph best supports the performance claim of Makita batteries as described in the caption over the graph? ____

a) nickel cadmium b) alkaline c) zinc carbon d) both b&c

[2] Which battery (s) is /are rechargable ? ____

a) nickel cadmium b) alkaline c) zinc carbon d) both b&c

[3] Which feature of the graph best represents the claim for delivery of , "consistent power" ____

a) a graph which starts highest on the vertical axis

b) a smoothly rounded slope

c) a long straight level line followed by a steep drop

d) a steep drop in the slope

[4] At point " A " the graph represents _____

a) unrealistic exaggeration and deception b) a slow recharging c) instant recharging d) both a&c

 

Answers: .64B "Makita", NiCad Advertisement

[1] Which graph best supports the performance claim of Makita batteries as described in the caption over the graph? a) nickel cadmium

[2] Which battery (s) is /are rechargable ? a) nickel cadmium

[3] Which feature of the graph best represents the claim for delivery of , "consistent power" c) a long straight level line followed by a steep drop

[4] At point " A " the graph represents a) unrealistic exaggeration and deception c) instant recharging d) both a&c

.64 Generators

 

.64A-Principles Electricity, Wires, and Magnets

 

What are the important variables effecting the generation of electric current? 24B-Variables affecting quantity of current generated

(Examples: 1-motion of either conductor or Magnet; 2-the number of coils in the conductor; 3-…)

Example1: Given a conductor, (coil of wire) and a magnet is the current generated affected by which one is moved?

Hypothesis: Given a conductor (coil of wire) and a magnet it does not matter which is moved to make an electrical current.

Variable manipulated : Trial #1 the conductor is moved as shown in the diagram

Trial #2 The magnet is moved as shown in the diagram.

Responding variable: The max current reading. shown on the meter.

Variables controlled: same coil of wire, magnet, movement speed, and meter is used in each trial.

 

Hypothesis: Given a conductor (coil of wire) and a magnet it does not matter which is moved to make an electrical current.

Data:

Manipulated Variable

#1

#2

Responding Variable

(average current reading after 5-6 trials)

 

Mark in the highest needle position.

1)_________

2)_________

3)_________

4)_________

5)_________

Av_________.

Mark in the highest needle position .

1)_1)_________

2)_________

3)_________

4)_________

5)_________

Av_________.

Conclusion: The hypothesis, Given a conductor (coil of wire) and a magnet it does not matter which is moved to make electrical energy. _________________ correct.

(is / is not )

Example2: Given a conductor, (coil of wire) and a magnet does the number of coils affect the current produced?

Hypothesis: Given a conductor (coil of wire) and a moving magnet a larger number of conducting coils makes more electrical energy.

Variable manipulated : Trial #1 the number of conductor coils as shown in the diagram

 

Responding variable: The max current reading. shown on the meter.

Variables controlled: same magnet,diameter of coil, size of wire movement speed, and meter is used in each trial.

Hypothesis: Given a conductor (coil of wire) and a moving magnet a larger number of conducting coils makes more electrical energy.

Data:

Manipulated Variable

( number of coils )

Trial#1

8 coils/unit

Trial#2

8 32 coils/unit

Responding Variable

(average current reading after 5-6 trials)

 

Mark in the highest needle position.

1)_________

2)_________

3)_________

4)_________

5)_________

Av_________.

Mark in the highest needle position .

1) ________

2)_________

3)_________

4)_________

5)_________

Av_________.

Conclusion: Given a conductor (coil of wire) and a moving magnet a larger number of conducting coils makes more electrical energy._______________ correct.

(is / is not)

 

.64B-Variables affecting quantity of current generated

Example-3 Now it is your turn to further investigation:

(Complete the following)

Example3: Fill in your question for further investigation

Given a conductor, (coil of wire) and a magnet does the _____________________________ affect the current produced?

Hypothesis: Given a conductor (coil of wire) and a moving magnet a l___________________________ makes more electrical energy.

Variable manipulated : Trial #1 ______________________ as shown in the diagram

 

Responding variable: The max current reading. shown on the meter.

Variables controlled:

 

 

Given a conductor, (coil of wire) and a magnet does the _____________________________ affect the current produced?

Hypothesis: Given a conductor (coil of wire) and a moving magnet a l___________________________ makes more electrical energy.

Data:

Manipulated Variable

( )

Trial#1

 

 

 

Trial#2

 

 

 

 

 

Responding Variable

(average current reading after 5-6 trials)

 

Mark in the highest needle position.

1)_________

2)_________

3)_________

4)_________

5)_________

Av_________.

Mark in the highest needle position .

1)_________

2)_________

3)_________

4)_________

5)_________

Av_________.

Conclusion: Given a conductor (coil of wire) and a moving magnet a _____________________________________________________(is / is not) correct

 

 

 

. .64C-Construction of a Dynamo (Bicycle Generator)

Label the following diagram as follows:

a) Magnet (source of magnetic energy)

b) Coil of wire

c) Mechanical energy input wheel (for turning the magnet)

 

Trace the circuit of the bulb

.64C (continued) Construction of a dynamo .

List the necessary parts of a dynamo generator.

1) ___________________________

2) ___________________________

3) ___________________________

 

Either take one apart and identify the parts or try to make a simple dynamo.