Lesson Plan Teknis | Electricity: Ohm's First Law

Objective

Duration: (15 - 20 minutes)

This stage of the lesson plan aims to ensure students grasp the theoretical underpinnings of Ohm's first law and its real-world applications. This understanding is vital for developing practical skills necessary for measuring and analyzing electrical circuits, which are immensely valuable in the job market, particularly in technical and engineering domains.

Objective Utama:

1. Understand the relationship between current, voltage, and resistance as outlined by Ohm's first law.

2. Apply Ohm's first law to tackle practical challenges in basic electrical circuits.

3. Develop hands-on skills in measuring current and voltage using multimeters.

Objective Sampingan:

1. Acknowledge the significance of Ohm's first law in designing and analyzing electrical circuits relevant to the job market.
2. Familiarize students with the basic components of an electrical circuit, including resistors and voltage sources.

Introduction

Duration: (15 - 20 minutes)

This stage of the lesson plan targets students' understanding of the theoretical principles underlying Ohm's first law and its practical uses. This knowledge is crucial for cultivating hands-on skills needed to carry out measurements and analyses of electrical circuits—skills that are highly regarded in the job environment, particularly in technical and engineering areas.

Curiosities and Market Connection

Did you know that electrical engineers rely on Ohm's first law every day to design electronic circuits in gadgets such as smartphones and laptops? In the job market, proficiency in electricity and electronics is highly sought after, especially in industries like industrial automation, telecommunications, and renewable energy. Major companies such as Siemens, General Electric, and Tesla employ numerous professionals who apply Ohm's first law in their daily operations to ensure the safe and efficient function of electrical systems.

Contextualization

Electricity plays a fundamental role in our everyday lives. From switching on a light bulb to powering complex industrial systems, everything relies on the controlled movement of electrons. Ohm's first law, introduced by the German physicist Georg Ohm, is a fundamental principle that explains how electric current behaves in a circuit. Mastery of this law is imperative for any practical use of electricity, whether in engineering projects, electronic systems, or maintaining home appliances.

Initial Activity

To kick off the class, showcase a brief video (3-5 minutes) highlighting the significance of Ohm's first law in real-life applications, such as the upkeep of household appliances or building basic electronic circuits. Then, pose an intriguing question: 'What do you think happens to electric current when we raise the voltage in a circuit?' Encourage students to exchange their thoughts.

Development

Duration: (50 - 55 minutes)

This phase of the lesson plan provides students with a practical chance to use Ohm's first law in a controlled setting, honing essential skills for analyzing and resolving issues in electrical circuits. Collaborating in groups also allows students to enhance their teamwork and communication skills, which are highly sought after in the job market.

Topics

1. Definition of Ohm's first law (V = IR)

2. Units of measurement: Volt (V), Ampere (A), and Ohm (Ω)

3. Components of an electrical circuit: resistors, voltage sources

4. Using multimeters to measure current and voltage

5. Addressing practical problems with Ohm's first law

Thoughts on the Subject

Encourage students to reflect on how Ohm's first law applies to everyday situations. For instance, prompt them to consider how fluctuations in battery voltage can impact the functionality of an electronic device. Urge them to contemplate the practical and economic ramifications of understanding and implementing Ohm's first law, especially in sectors reliant on electricity and electronics.

Mini Challenge

Building a Simple Circuit

Students will create a straightforward electrical circuit featuring a voltage source, a resistor, and a multimeter to gauge current and voltage.

1. Divide the students into groups of 3-4.

2. Provide each group with a voltage source (9V battery), a resistor (220Ω), connecting wires, and a multimeter.

3. Guide students in assembling the circuit with the resistor linked to the battery and the multimeter arranged for measuring current flowing through the circuit.

4. Ask students to note down the current reading from the multimeter.

5. Then, direct them to measure the voltage across the resistor's terminals and document the value.

6. With the recorded current and voltage values, have students calculate the resistance using Ohm's first law and compare it with the nominal resistor value (220Ω).

7. Encourage students to discuss any discrepancies between the measured and expected values, considering potential sources of error.

Foster practical skills in circuit assembly and using multimeters to measure current and voltage, along with applying Ohm's first law to solve real-world challenges.

**Duration: (35 - 40 minutes)

Evaluation Exercises

1. Calculate the current through a 330Ω resistor connected to a 12V voltage source.

2. Determine the voltage necessary for a current of 0.5A to flow through a 100Ω resistor.

3. If a 470Ω resistor is linked to a 5V source, what is the current passing through it?

4. Discuss the necessity of accurately measuring current and voltage in an electrical circuit concerning the maintenance of electronic devices.

Conclusion

Duration: (10 - 15 minutes)

This phase of the lesson plan seeks to cement students' learning, enabling them to reflect on the practical activities undertaken and comprehend the application of theory in real-world contexts. Moreover, it reinforces the relevance of the content learned for the job market, inspiring students to cherish and apply their newfound knowledge.

Discussion

Facilitate an open discussion where students can share their thoughts and insights on the lesson. Inquire how the practical experiments helped them grasp Ohm's first law. Encourage them to reflect on the challenges they faced during the circuit assembly and their experiences measuring with the multimeter, as well as the solutions they discovered. Foster a discussion on how the skills acquired during the lesson can be translated into real-world situations in the job market, particularly in technical and engineering sectors.

Summary

Summarize the key topics covered during the lesson, including the definition of Ohm's first law, the measurement units (Volt, Ampere, and Ohm), and the fundamental components of an electrical circuit. Remind them of the steps taken in the hands-on activity of building the simple circuit and the importance of accurate measurements of current and voltage. Stress the direct connection between theory and practice evidenced throughout the lesson.

Closing

Clarify that the lesson bridged the theory of Ohm's first law with practical tasks of assembly and measurement in electrical circuits, illustrating its relevance in day-to-day scenarios. Highlight the significance of Ohm's first law in daily life, from maintaining household appliances to designing electronic circuits in advanced devices. Conclude by reiterating that the practical skills acquired are greatly valued in the job market and vital for various technical fields.