11 Questions
What happens to the resistance of a thermistor as the temperature decreases?
It increases
Which component of a transistor is responsible for controlling the flow of current between the Collector and Emitter?
Base
In electronics, what is the function of a variable resistor?
Adjusts the resistance in a circuit
What type of switch will return to its OFF position when the button is released?
Push to Make
When a small current is registered at the Gate of a thyristor, what action does the device take?
It latches and allows a large current to flow
What is the function of a potentiometer?
Adjust voltage
Which device converts chemical energy into electrical energy?
Battery
What is the main purpose of a reed switch?
Close and complete a circuit
Which instrument measures current in a circuit?
Ammeter
What does a Light Dependent Resistor (LDR) do in different lighting conditions?
Has low resistance in light conditions and high resistance in the dark
What characteristic distinguishes an LED from a regular diode?
Emits light when electrons pass through it
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
Test your knowledge on electrical symbols and components with this multiple-choice quiz containing 15 questions. Questions cover symbols for AC supply, ammeter, battery, bulb, buzzer, diode, and more.
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