GCSE Electronics Eduqas
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37 topics in 6 modules
☑️ Component Knowledge 5 topics
- Passive Components: Resistors, Variable Resistors, Capacitors, Inductors
- Active Components: Transistors, Diodes, Light Emitting Diodes, Op-Amps, Thyristors
- Input Components: Switches, Sensors, Microphones, Thermistors, Light-dependent Resistors
- Output Components: LEDs, Lamps, 7-Segment Displays, Motors, Speakers, Relays
- Integrated Circuits: Logic Gates, Timers, Counters, Decoders, Multiplexers
☑️ Circuit Analysis and Design 10 topics
- Series and Parallel Circuits
- Ohm's Law and Calculations
- Kirchhoff's Laws
- Operation of Basic Circuits
- Representation of Circuit Diagrams
- Circuit Analysis Techniques
- Component Values and Tolerance
- Voltage Dividers and Power Calculations
- Oscillator Circuits
- Signal Conditioning and Amplification
☑️ Digital Electronics 6 topics
- Binary and Hexadecimal Number Systems
- Logic Gates, Truth Tables, and Boolean Algebra
- Combinational and Sequential Logic
- Flip Flops, Binary Counters, and Registers
- Encoders, Decoders, and Multiplexers
- Digital-to-Analog, and Analog-to-Digital Conversion
☑️ Microcontrollers and Programming 5 topics
- Introduction to Microcontrollers and Microprocessors
- Input and Output Devices
- Basic Programming Concepts: variables, loops, conditionals, functions
- Programming Languages: Assembler or 'C'
- Interfacing Microcontrollers with other Devices
☑️ Power Supplies 6 topics
- Transformers: Types, and Transformer Ratios
- Rectification, Smoothing, and Regulation
- Types of Rectifiers: Half-Wave, Full-Wave, bridge rectifiers
- Voltage Regulation
- Linear and Switch-mode Supplies
- Battery Types, Charging and Discharging
☑️ Communication Systems 5 topics
- Analog and Digital Communication
- Modulation and Demodulation Techniques
- Radio, Infrared, and Optical Communication
- Wired and wireless communication
- Basic principles of Internet and IoT technology
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GCSE Electronics Eduqas Revision Content
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GCSE Electronics Eduqas - Component Knowledge - Passive Components: Resistors, Variable Resistors, Capacitors, Inductors Content Preview
Component Knowledge
Passive Components: Resistors, Variable Resistors, Capacitors, Inductors
Resistors
- Resistors are electrical devices that limit or regulate the flow of electrical current in an electronic circuit.
- They are characterised by their resistance value (measured in Ohms, Ω) which, in simplified terms, describes their ability to resist the flow of electricity.
- They follow Ohm's Law (V=IR), which states that the voltage (V) through a resistor is equal to the product of the current (I) through it and its resistance (R).
- Resistors are linear devices meaning that their voltage is directly proportional to the current.
- Fixed resistors have a defined value that cannot change. Examples include carbon film resistors or metal oxide resistors.
- Resistors can come in different power ratings, indicating how much power they can safely dissipate as heat.
Variable Resistors
- A variable resistor, also called a potentiometer, allows the resistance to be changed within a certain range.
- Variable resistors can be used to adjust current, divide voltage, or simply as a tuning component in some circuits.
- It comprises of a resistor with a sliding contact (wiper) which makes it possible to adjust the resistance.
Capacitors
- Capacitors store electrical energy in an electric field.
- They consist of two conductive plates separated by an insulator, known as the dielectric.
- The capacitance, measured in Farads (F), is the measure of a capacitor's ability to store electrical energy.
- When voltage is applied to a capacitor, an electric field is created between the plates, causing a positive charge to accumulate on one plate and a negative charge on the other.
- Capacitors block direct current (DC) and allow alternating current (AC) to pass through.
Inductors
- Inductors, also known as coils, are passive devices used in electronic circuits to store energy in a magnetic field when electric current is flowing through it.
- The unit of inductance is the Henry (H).
- They are often used in filters, sensors and transformers.
- They are characterised by their ability to resist changes in current and can block or slow down changes in voltage.
- Similar to capacitors, inductors also affect AC and DC differently. They pass direct current (DC) and can resist or block alternating current (AC) due to electromagnetic induction.
Question: Explain why a capacitor placed in series between two circuit stages can pass an AC signal whilst blocking any DC component.
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