q1 elec symbols

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araaa ☆

Cards (68)

What is the function of an NPN transistor?
It permits flow of current when the base has high potential.
What is the function of a PNP transistor?
It allows current flow when there is low potential at the base.
What type of transistor is an N-channel JFET?
A junction field effect transistor.
What type of transistor is a P-channel JFET?
A P-channel field effect transistor.
What does a voltmeter measure?
It measures voltage.
Why does a voltmeter have very high resistance? 
To avoid drawing significant current from the circuit being measured.
How is a voltmeter connected in a circuit?
It is connected in parallel.
What does an ammeter measure? 
It measures electric current.
Why does an ammeter have near zero resistance?
To minimize the impact on the circuit and allow maximum current flow.
How is an ammeter connected in a circuit? 
It is connected in series.
What does an ohmmeter measure?
It measures resistance.
What does a galvanometer measure?
It measures very small currents in the order of 1 milliampere or less.
What is an SPST switch also known as?
It is also known as the ON/OFF switch.
What does an SPST switch do?
It permits current flow only when it is ON.
What is an SPDT switch also known as?
It is also known as a 2-way switch.
What does an SPDT switch do?
It causes the flow of current in two directions, depending on its position.
What is a momentary switch that is normally open called?
It is called a pushbutton switch (N.O.).
What is a momentary switch that is normally closed called?
It is called a pushbutton switch (N.C.).
What is a DPST switch also known as?
It is also called a dual ON-OFF switch.
What does a DPST switch do?
It isolates between the live and neutral connections in the main electrical line.
What is a DPDT switch used for?
It is applied as a reversing switch for motors.
What is the function of an AND gate?
It has high outputs when the inputs are high.
What is the function of a NAND gate?
It has low output when all the inputs are high.
What is the function of an OR gate?
It has high output when one of the inputs is high.
What is the function of a NOR gate?
It has low output if both inputs are low.
What is the function of an EX-OR gate?
It has high output when inputs are different.
What is the function of an EX-NOR gate?
It has high output when both inputs are either high or low.
What is the function of a NOT gate?
It has high output when the input is low.
What is the function of a lamp?
It provides light as the output.
What is the function of an indicator lamp? 
It converts electrical energy into light.
What is the function of a heater? 
It changes electrical energy into heat.
What does an inductor do?
It produces a magnetic field when a certain current is passed through a coil of wire.
What is the function of a motor?
It converts electrical energy into mechanical energy.
What does a bell do?
It produces a sound as the output according to the electrical energy produced as the input.
What does a buzzer do? 
It produces a sound as the output according to the electrical energy produced as the input.
What is the function of a microphone? 
It converts sound to its corresponding electrical energy.
What does an earphone do?
It reverses the process of a microphone and converts electrical energy into sound.
What does a loudspeaker do?
It converts an amplified version of electrical energy into its corresponding sound.
What is the function of an amplifier? 
It is used to amplify a signal.
What do schematic diagrams represent in electronics?
Circuits or connections