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Education /Grade 12 Electronics: Key Components

Grade 12 Electronics: Key Components

Education10 CardsCreated 2 months ago

This deck covers essential concepts and components in electronics, including bridge rectifiers, LDRs, thermistors, and transistors, suitable for Grade 12 exam preparation.

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What is a bridge rectifier?

A bridge rectifier is a circuit that converts alternating current (AC) into direct current (DC) using four diodes in a bridge configuration.

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Key Terms

Term

Definition

What is a bridge rectifier?

A bridge rectifier is a circuit that converts alternating current (AC) into direct current (DC) using four diodes in a bridge configuration.

How does a bridge rectifier work during the positive half cycle?

During the positive half cycle, two diodes conduct and allow current in one direction.

What is an LDR and how does it behave?

An LDR, or light-dependent resistor, is a component whose resistance decreases with bright light and increases in darkness.

What are common uses for LDRs?

LDRs are used in light sensors, such as automatic street lights, light-activated switches, and security alarms.

Define a thermistor and its types.

A thermistor is a temperature-sensitive resistor. NTC thermistors decrease resistance with increasing temperature, while PTC thermistors increase resi...

What is the primary use of thermistors?

Thermistors are commonly used for temperature sensing in devices like digital thermometers and fire alarms.

Describe the basic structure of a transistor.

A transistor has three terminals: base (control), collector, and emitter.

How does a transistor amplify signals?

A small current or voltage at the base controls a larger current between the collector and emitter, allowing signal amplification.

What are the main types of transistors covered in Grade 12?

The main types are Bipolar Junction Transistors (BJT), specifically NPN and PNP.

List some applications of transistors.

Transistors are used for signal amplification, electronic switches, and in various electronic devices for control and signal processing.

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Grade 12 Electronics: Key Components

Term	Definition
What is a bridge rectifier?	A bridge rectifier is a circuit that converts alternating current (AC) into direct current (DC) using four diodes in a bridge configuration.
How does a bridge rectifier work during the positive half cycle?	During the positive half cycle, two diodes conduct and allow current in one direction.
What is an LDR and how does it behave?	An LDR, or light-dependent resistor, is a component whose resistance decreases with bright light and increases in darkness.
What are common uses for LDRs?	LDRs are used in light sensors, such as automatic street lights, light-activated switches, and security alarms.
Define a thermistor and its types.	A thermistor is a temperature-sensitive resistor. NTC thermistors decrease resistance with increasing temperature, while PTC thermistors increase resistance with increasing temperature.
What is the primary use of thermistors?	Thermistors are commonly used for temperature sensing in devices like digital thermometers and fire alarms.
Describe the basic structure of a transistor.	A transistor has three terminals: base (control), collector, and emitter.
How does a transistor amplify signals?	A small current or voltage at the base controls a larger current between the collector and emitter, allowing signal amplification.
What are the main types of transistors covered in Grade 12?	The main types are Bipolar Junction Transistors (BJT), specifically NPN and PNP.
List some applications of transistors.	Transistors are used for signal amplification, electronic switches, and in various electronic devices for control and signal processing.