Basic Electricity - Senior Secondary 1

TERM: 3^RD TERM

WEEK ONE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: OHM’S LAW

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

I.) State ohm's law

II.) Discuss the relationship between voltage, current and resistance

III.) State the applications of ohm's law in DC circuit

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION	TEACHER’S ACTIVITY	STUDENT’S ACTIVITY
STEP 1 INTRODUCTION	The teacher state and explain ohm's law and it's applications in DC circuit	Students listens attentively to the teacher
STEP 2 EXPLANATION	Teacher discusses the relationship between voltage, current and resistance	Students exhibit attentiveness and active engagement
STEP 3 NOTE TAKING	The teacher writes a summarized note on the board	The students copy the note in their books

NOTE

OHM’S LAW

Ohm's Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. Mathematically, it's expressed as I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms.

Relationship between voltage, current and resistance

The relationship between voltage, current, and resistance is governed by Ohm's Law.

Voltage (V): Voltage is the electrical potential difference between two points in a circuit. It's like the "push" that drives the flow of electrons through a circuit. Voltage is measured in volts (V).
Current (I): Current is the flow of electric charge (electrons) through a conductor. It's the rate of flow of charge past a point in a circuit. Current is measured in amperes (A).
Resistance (R): Resistance is a measure of how much a material opposes the flow of electric current. It's like the "friction" in the circuit that impedes the flow of electrons. Resistance is measured in ohms (Ω).

Ohm's Law (V = I x R) shows the relationship between these three quantities.

- If you increase the voltage (V) in a circuit while keeping the resistance (R) constant, the current (I) will increase.

- Conversely, if you increase the resistance (R) while keeping the voltage (V) constant, the current (I) will decrease.

- Similarly, if you decrease the resistance (R), the current (I) will increase for a given voltage (V).

Applications of ohm's law in DC circuit

Ohm's Law is fundamental in DC (Direct Current) circuits and finds applications in various aspects of electrical engineering and electronics:

Ohm's Law is used to analyze circuits to determine unknown quantities such as voltage, current, or resistance. It allows engineers to predict and understand the behavior of circuits.
Engineers use Ohm's Law when designing circuits to ensure that components operate within safe limits. It helps in selecting appropriate resistors, determining power dissipation, and verifying circuit performance during testing.
Ohm's Law is crucial in voltage regulation circuits, such as voltage dividers and voltage regulators.
Ohm's Law can be used to calculate power dissipation in resistive components within a circuit. The power (P) dissipated in a resistor can be calculated using P = V x I or P = I² x R, where V is voltage, I is current, and R is resistance.

EVALUATION: 1. State ohm's law

Discuss the relationship between voltage, current and resistance
Mention 3 applications of ohm's law in DC circuit

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively

Basic Electricity - Senior Secondary 1 - Ohm's law