CHEMICAL EFFECT OF ELECTRIC CURRENT
GENERAL OBJECTIVES
The students will be able to recall example of good & bad conductors.
The students will be able to recognize liquid that conduct electricity.
The students will be able to discriminate between liquids which are good &bad conductors.
The students will be able to classify liquid materials as good & bad conductors.
The students will be able to give new illustration of liquids which can conduct electricity.
The students will be able to give scientific reason for glowing of bulb in some liquids.
The students will be able to record the list of material & the observation.
The students will be able to perform experiments with reasonable speed & accuracy of electric circuit.
CONCEPT
Examples of solid good conductors & bad conductors of electricity.
Liquids which can conduct electricity are good conductors of electricity.
Liquids which cannot conduct electricity are poor conductors of electricity.
PRIOR KNOWLEDGE
Examples of the good & bad conductors of solids and also with the knowledge of the electric circuit diagram.
INSTRUCTIONAL MATERIALS
Copper wire, wooden ruler, Plastic ruler, Steel ruler, Spoon, Rubber band, Glass, Paper, Lemon juice,
Honey, Milk, Soft drink, Tap water, Sugar water, Distilled water, Ethanol, Salt water, Vinegar.
SET INDUCTION
Teacher distributes the worksheet to the students
MATERIAL
Bulb glows
Bulb doesn’t glows
Copper wire
Wooden ruler
Plastic ruler
Steel ruler
Spoon
Rubber band
Glass
Paper
Based on worksheet teacher introduces the topic “ChemiCal effeCts of eleCtriC Current”.
DEVELOPMENT
Activity 1:-
Teacher performs the experiments of the conductivity of the solid materials.
MATERIAL
Bulb glows
Bulb doesn’t glows
Copper wire
Wooden ruler
Plastic ruler
Steel ruler
Spoon
Rubber band
Glass
Paper
Based on this teacher explains the electrical conductivity through solids.
Activity 2:-
Teacher now performs another experiment with different liquids to show liquids as good or bad
conductors of electricity.
MATERIALS
Does it conduct electricity
Yes
No
Good conductors
Poor conductors
Lemon juice
Honey
Milk
Soft drink
Tap water
Sugar water
Distilled water
Ethanol
Salt water
Vinegar
Based on this teacher explains the good and poor conductors of electricity in liquid and also explains the
term chemical effect of electric current.
EVALUATION
Q.1) Answer the following question.
a)
What do you mean by chemical effects of electric current?
b) What are good conductors? Give example of good conductors of liquid.
c)
What are pure conductors? Give example of pure conductors of liquid.
d) Why the bulb doesn’t glow when it’s poor/bad conductor?
e) In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the
area, and Explain why they do this.