Basic Electricity - Senior Secondary 1 - Electric field

TERM: 1^ST TERM

WEEK ELEVEN

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: ELECTRIC FIELD

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define electric field

II.) Describe capacitance

III.) Identify the types of capacitors

IV.) Connect capacitors in series and parallel

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

ELECTRIC FIELD

An electric field is a region surrounding an electrically charged particle or object within which another charged particle experiences a force. It's a fundamental concept in physics that describes the influence a charge exerts on its surroundings.

Capacitance

Capacitance is a measure of an object's ability to store electric charge. It's defined as the ratio of the amount of stored charge to the electric potential difference between the two conductors involved. Essentially, it quantifies how much charge can be stored per unit voltage.  Its formula is

C = QV

where C is capacitance, 

Q is the charge stored on one of the plates (in coulombs),

and V is the voltage across the plates (in volts).

Types of capacitors

There are various types of capacitors, including:

1. Ceramic capacitors
2. Electrolytic capacitors (which further include aluminum electrolytic and tantalum electrolytic capacitors)
3. Film capacitors (like polyester film, polypropylene film, and metallized film capacitors)
4. Variable capacitors
5. Supercapacitors (also known as ultracapacitors)

Connection of capacitance in series and in parallel

1. Capacitors in Series:

   - When capacitors are connected in series, their total capacitance decreases.

   - This happens because the effective distance between the plates increases, making it harder for the electric field to build up across all capacitors.

   - Mathematically, the reciprocal of the total capacitance (1/C_total) in series is equal to the sum of the reciprocals of the individual capacitances (1/C_total = 1/C1 + 1/C2 + ... + 1/Cn).

2. Capacitors in Parallel:

   - When capacitors are connected in parallel, their total capacitance increases.

   - This occurs because each capacitor adds its capacitance to the total, resulting in more charge storage capacity.

   - Mathematically, the total capacitance in parallel is the sum of the individual capacitances (C_total = C1 + C2 + ... + Cn).

EVALUATION: 1. What is electric field

2. Define capacitance
3. Identify 5 types of capacitors you know

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively