Electronics Flashcards
What does PCB stand for?
Printed circuit board
What does an electrical conductor do?
An electrical conductor allows electricity to flow through it easily.
What is the main element used for making semiconductors?
Silicon.
A common operational amplifier is the:
741 Op-Amp.
What is a material that can exhibit both insulating and conducting properties?
Semiconductor.
An insulator has what sort of value?
An insulator has a high resistivity value.
When describing integrated circuits, what do the initials DIL stand for?
DIL stands for Dual In Line - referring to the two rows of connections on either side of the chip.
What does IC stand for?
Integrated circuit
On a diode, what would be indicated by a silver band at one end?
On a diode, the cathode is indicated by a silver band on one end.
What does LED stand for?
light-emitting diode.
What does a resistor do?
Resistors restrict or limit the flow of current in a circuit. The ability of a material or component to resist current flow is measured in ohms.
How many main types of resistor are there?
There are three main types of resistor:
Can you name the three main types of resistor?
Fixed, variable and specials like LDR, THERMISTOR
What does LDR stand for?
Light Dependent Resistor
What is a 555n?
a timing IC
What are the two main types of circuit a 555 are used for?
Monostable and Astable
What does Monostable mean?
it will only switch once as in MONO
What does Astable mean?
I switches constantly from one state to another. From off to on back to off. (it does not have A STABLE state)
What is a Light-dependent resistors (LDRs)
Light-dependent resistors (LDRs) change resistance as light levels change. The light levels are detected by a photo-sensitive plate on the resistor. Most LDRs have a negative light coefficient, meaning that their resistance falls as the amount of light falling on them increases. LDRs are used in light-detection circuit
What is a Thermistor?
Thermistors change resistance as temperatures change. Most thermistors have a negative temperature coefficient, meaning their resistance falls as temperature increases. Thermistors are used in temperature-sensing circuits.
What is a Potential divider?
Potential dividers divide up the voltage within a circuit, so that parts of a circuit only receive the voltage they require. Potential dividers usually consist of two or more resistors arranged in series across a power supply.
Why would you expect to see a potential divider in a sensing circuit?
Potential dividers form an important part of sensor circuits. For example, an LDR or thermistor can be used to control the input voltage to an op-amp or IC
What is a Capacitor?
A capacitor is a discrete component that can store an electrical charge. The larger the capacitance the more charge it can store.
What is the unit of measurement for a Capacitor?
The unit of measurement of capacitance is the farad.
