Physics- O – level- D.C. circuits

Sec 4

Course Intro

Understand the fundamental principles of direct current (D.C.) circuits – Ohm’s law, the effective resistance of the circuit, conservation of electrical energy, introduction to oscilloscopes, the resistivity of the material, and working of the thermistor. Explore the world of circuit components and their role in electronics. Learn how to apply circuit theory to practical problem-solving.

Course Description

This course takes you into the world of D.C. circuits, covering topics from circuit diagrams to advanced problem-solving with NTC thermistors and light-dependent resistors. Explore the principles and applications of D.C. circuits in various electronics domains.

Who is this Course for?

  • Secondary 4 / Secondary 5 / O Level students who want to gain insights into electronics and circuitry.
  • Anyone seeking a comprehensive understanding of D.C. circuits for academic or practical purposes
  • Students who are interested in the concept of resistivity, which is a measure of a material’s resistance to electrical current.

What you will Learn?

  • Master circuit diagram creation with various components.
  • Understand the behavior of current in series and parallel circuits.
  • Calculate potential differences and effective resistance.
  • Apply Ohm’s Law and circuit calculations.
  • Explore variable potential dividers and transducers.
  • Solve complex circuit problems using NTC thermistors and LDRs.

Key Takeaways

  • Create precise circuit diagrams for different applications.
  • Apply the principles of current in series and parallel circuits.
  • Calculate potential differences and effective resistance effortlessly.
  • Use Ohm’s Law to solve real-world circuit problems.
  • Gain hands-on experience with variable potential dividers and transducers.

Why Learn from doerdo Tuition Course?

Experienced Teachers: Benefit from the guidance of experienced ex-MOE educators.

Detailed Performance Insights: Parents can monitor student performance.

After-Class Support: Get assistance with homework and doubts.

A.I. Based Testing: Assess your understanding through AI-powered tests.

Engaging Homework: Enhance your learning with interactive AI-powered homework.

Course Curriculum

Circuit Diagrams with Components: Explore how to create circuit diagrams with power sources, switches, lamps, LEDs, resistors, fuses, ammeters, and voltmeters. Learn to visually represent electronic circuits effectively.
Current in Series Circuits: Understand that in a series circuit, the current at every point remains constant. Discover how to calculate and apply current in series configurations.
Potential Differences in Series Circuits: Learn that the sum of potential differences in a series circuit equals the overall potential difference. Apply this principle to solve problems involving series circuits.
Current in Parallel Circuits: Discover that in a parallel circuit, the sum of currents in separate branches equals the current from the source. Apply this concept to analyze parallel circuits.
Potential Differences in Parallel Circuits: Realize that potential differences across separate branches in a parallel circuit are equal. Apply this knowledge to ensure consistent potential differences.
Effective Resistance in Series and Parallel: Calculate effective resistance for resistors in series and parallel. Apply this skill to simplify complex resistor networks.
Circuit Calculations: Utilize Ohm’s Law and other relationships for current, potential differences, and resistors in series and parallel circuits to solve practical circuit problems.
Variable Potential Divider (Potentiometer): Explore the functionality of potentiometers in dividing voltage and obtaining variable outputs. Understand their applications, especially in volume controls.
NTC Thermistors and Light-Dependent Resistors: Study the characteristics of NTC thermistors (temperature-sensitive resistors) and light-dependent resistors (LDRs). Learn how they function as input transducers in potential dividers.
Problem Solving with NTC Thermistors and LDRs: Apply the resistance characteristics of NTC thermistors and LDRs to solve circuit problems related to temperature and light. Example: Regulating oven temperature with an NTC thermistor.

Course Type


Class Type

Small Group

Group Size



1.5 hrs

Num of Sessions




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Learn from doerTeachers


Young Wai Keong Vincent

Ex MOE Teacher
18+ Years Exp
Math & Science Subject Expert

Mary Lin An Chin

Ex MOE Teacher
20+ Years Exp
Math and English Subject Expert

Suriawati Binte Sulaimi

Ex MOE Teacher
17+ Years Exp
Math and Science Subject Expert

Tan Qianru

Ex MOE Teacher
11+ Years Exp
Chinese Subject Expert

Yee Hong Ng

Ex MOE Teacher
12+ Years Exp
Chinese Subject Expert

Nur Aqilah Binte Mohammad Mazni

Ex MOE Teacher
4+ Years Exp
English Subject Expert