Podcast
Questions and Answers
What happens to the resistance of a thermistor as the temperature decreases?
What happens to the resistance of a thermistor as the temperature decreases?
- It becomes infinite
- It remains constant
- It decreases
- It increases (correct)
Which component of a transistor is responsible for controlling the flow of current between the Collector and Emitter?
Which component of a transistor is responsible for controlling the flow of current between the Collector and Emitter?
- Gate
- Emitter
- Base (correct)
- Collector
In electronics, what is the function of a variable resistor?
In electronics, what is the function of a variable resistor?
- Regulates the flow of current
- Converts AC to DC current
- Transforms electrical energy into mechanical energy
- Adjusts the resistance in a circuit (correct)
What type of switch will return to its OFF position when the button is released?
What type of switch will return to its OFF position when the button is released?
When a small current is registered at the Gate of a thyristor, what action does the device take?
When a small current is registered at the Gate of a thyristor, what action does the device take?
What is the function of a potentiometer?
What is the function of a potentiometer?
Which device converts chemical energy into electrical energy?
Which device converts chemical energy into electrical energy?
What is the main purpose of a reed switch?
What is the main purpose of a reed switch?
Which instrument measures current in a circuit?
Which instrument measures current in a circuit?
What does a Light Dependent Resistor (LDR) do in different lighting conditions?
What does a Light Dependent Resistor (LDR) do in different lighting conditions?
What characteristic distinguishes an LED from a regular diode?
What characteristic distinguishes an LED from a regular diode?
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Study Notes
Electrical Components and Instruments
- AC supply: allows access to mains power
- Ammeter: measures current
- Battery: converts chemical energy into electrical energy
- Bulb: an output device that gives out light
- Buzzer: an output device that gives out sound
Semi-Conducting Materials
- Diode: allows current to flow in one direction
- LDR (Light Dependent Resistor): has low resistance in light conditions and high resistance in dark conditions
- LED (Light Emitting Diode): emits light when electrons pass through it
Output Devices
- Motor: produces rotary motion
Switches and Resistors
- Potentiometer: a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider
- Reed Switch: a glass casing with a switch inside that closes when a magnet passes over, completing the circuit
- Resistor: provides fixed resistance to the flow of electrons
- Single Pole Double Throw (SPDT) switch: can be ON in either position, to switch on separate devices
- Single Pole Single Throw (SPST) switch: the simplest on/off switch with one moveable arm contact and one switching position
- Variable Resistor: an adjustable resistor
Temperature Dependent Components
- Thermistor: a temperature dependent resistor, with resistance increasing as temperature rises and decreasing as it falls
- Thyristor: latches and allows a large current to flow between the Anode and Cathode when a small current is registered at the Gate
Other Components
- Transistor: a sensitive electronic switch with a Base, Collector, and Emitter
- Voltmeter: measures voltage
Specialized Switches
- Push to Make switch: returns to its OFF (normally open) position when the button is released
- Push to Break switch: returns to its ON (normally closed) position when the button is released
- Toggle Switch: a lever is thrown or flipped to make or break the connection
- Microswitch: designed for situations where the connection has to be broken by a moving object
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