REMARKS VI. REFLECTION - Use Effects 1

Use Effects 1

V. REMARKS VI. REFLECTION

In a simple electric circuit, voltage is defined as the work done per unit charge.

V = W/q

Current is also defined as the amount of charge passing through a point per unit time.

I = q/t Multiplying V and I, we get

VI = W/q . q/t = W/t =P Therefore:

P = VI

In a simple electric circuit, electric power is the product of current and voltage. Hence:

Power = Voltage x Current

P = VI where: P = power in watts

V = voltage in volts I = current in amperes

Voltage and current are positively related to power.

Appliance with high voltage across it, or with high current through it, it has high power or rate of converting electrical energy to other forms.

I. Evaluating Learning

Write TRUE if the statement is true. If the statement is incorrect, change the underlined word or words to make the statement correct.

1. When the current in the circuit is doubled, the power also doubles.

2. Electrical appliances at home transfer energy from the mains supply to heat and light our homes.

3. Minimizing television viewing is not a way of saving electrical energy.

4. High power rating electrical appliances give low electrical energy consumption.

5. Heating appliances like flat iron, toaster and electric stove draw more current so they convert more electrical energy than non- heating appliances.

J. Additional activities for application or remediation

Make a list of electrical appliances/machines which used electricity in the following environment:

1. at home 2. at the hospital 3. at school 4. in the city

For each item, try to think of an alternative and a way to conserve or save power.

V. REMARKS VI. REFLECTION

A. No. of learners who earned 80% in the evaluation

B. No. of learners who require additional activities for remediation who scored below 80%

C. Did the remedial lessons work? No. of learners who have caught up with the lesson

D. No. of learners who continue to require

remediation

Which of my teaching strategies worked well?

Why did these worked?

F. What difficulties did I encounter which my

principal or supervisor can help me solve?

G. What innovation or localized materials did I Use or discover which I wish to share with other teachers?

GRADES 1 to 12 School Grade Level Grade 8

Daily Lesson Log Teacher Learning Area Science

Teaching Date and

Time Quarter First (Physics)

DAY:

I. OBJECTIVES

A. Content Standards

The learners demonstrate an understanding of current-voltage-resistance relationship, electric power, electric energy and home circuitry.

B. Performance Standards The learners shall be able to practice safety in handling electrical devices.

Learning Competencies / Objectives Write the LC code for each

S8 30FE – Ii - 33

 Explain the functions of circuit breakers, fuses, earthing, double insulation, and other safety devices in the home.

Objective:

Describe a fuse and a circuit breaker and identify their functions in a circuit

II. CONTENT Module VI: ELECTRICITY:

Lesson 32: Safety in Using Electricity: CIRCUIT PROTECTORS III. LEARNING RESOURCES

A. References

1. Teacher's Guide Pages pp. 45 - 46 2. Learner's Materials Pages pp. 64-67 3. Textbook Pages

4. Additional Materials from Learning

Resource (LR) portal EASE Physics, Module 7. Lessons 3 and 4

B. Other Learning Resource Science and Technology IV : Physics Textbook. NISMED.2012 pp.

174 - 175 IV. PROCEDURES

A. Reviewing previous lesson or presenting the new lesson

Recall from the previous lesson electrical appliances that contain heating element.

B. Establishing a purpose for the Lesson

Let the students discuss among themselves the answers on the question, “What do you think is the effect of electric shock in the human body. Why is electrical safety important?

C. Presenting examples / instances of the new lesson

How many of you have seen a fuse or a circuit breaker at home? Did you ever wonder why a fuse is needed in your electrical connections? Today we will handle a fuse and determine its function.

D. Discussing new concepts and practicing new skills #1

Do the activity on Blowing a Fuse, Lesson Guide Grade 8 First Quarter pp. 136 – 137.

Discussing new concepts and practicing new skills #2

Case 1

1. What two things were observed when the switch was closed?

Case 2

1. What three things were observed when a short wire was connected as shown in the diagram?

2. What could have caused the rising and falling of current in the wire in case 2?

3. Describe the result when there was reduced resistance in the circuit.

4. Identify the case that occurred 5. Explain why the bulb went off.

6. What is the role of the fuse in the circuit?

F. Developing mastery

(Leads to Formative Assessment 3) Discuss the answers in the activity given.

G. Finding practical applications of concepts and skills in daily living

Why is it dangerous to use copper strip or wire in place of a safety fuse that blows out?

Why do we need to be protected from the danger in electricity?

H. Making generalizations and abstractions about the lesson

Fuses and circuit breakers are both devices that 'break' if the current through them is too large.

A fuse is usually a thin piece of wire that will melt and break the circuit if too large a current flows through it. The thicker the wire the more current is needed to melt it and the higher the 'rating' of the fuse. The purpose of a fuse is to protect the wiring and the equipment.

A circuit breaker is an electronic circuit that will switch off the current if it is too great. Such a circuit is designed to operate much more quickly than a fuse and so the damage is less because the current is switched off in a much shorter time. Circuit breakers are often used to protect the user if the casing of the equipment becomes live. They break the circuit before the person using the equipment gets a near fatal shock.

Grounding is a method of giving electricity the most effect way to return to the service panel. The ground wire is an additional path for electrical current to return safely to ground without danger to anyone in the event of a short circuit. In that instant, the short would cause the current to flow through the ground wire, causing a fuse to blow or a circuit breaker to trip.

An ungrounded electrical box, appliance, power tool, or extension cord could become a danger if there is no path to ground, except through you.

I. Evaluating Learning

Direction: Write the word SAFE if the statement is true and DANGER if the statement is wrong.

1. Fuses and circuit breakers are both devices that 'break' if the current through them is too large. ( safe )

2. A fuse is usually a thick piece of wire that will melt and break the circuit if too little amount of current flows through it. (danger) 3. Grounding is a method of giving electricity the most effect way to return to the service panel. (safe)

4. Electrical safety tips need to be observed frequently. (danger) 5. A properly grounded circuit has boxes, devices, and service panel grounds that give the electrical current the easiest path to ground and that reduces the chances of someone getting a shock or getting electrocuted. (safe)

J. Additional activities for application or

remediation Make a research on Octopus Wiring.