Basic Electronics Study Guide
What is a transformer? - Answer An apparatus that reduces and increases the voltage of an
alternating current.
How does a transformer work? - Answer It's an electrical device that takes electricity of one
voltage and changes it into another voltage.
What is the symbol for a transformer? - Answer
What is a coil? - Answer It's wires that is wrapped around a magnet of a transformer.
How does a coil work? - Answer When electricity flows through the wires, it creates a
magnetic field, which creates a current.
What is a diode? - Answer A specialized electronic component with two electrodes called
anode(current flows in) and cathode(current flows out).
What is a rectifier diode do? - Answer It only allows an electrical current to flow in one
direction and is mainly used for power supply operation. They can hold higher currents than
regular diodes and can change AC current to DC current.
What is the relay? - Answer It's an electrical device that incorporates an electromagnet, that
is activated by a current or signal in one circuit to open or close another circuit.
How does a relay work? - Answer When power flows through the first circuit, it activates the
electromagnet which creates a magnetic field around the coil. This magnetic field pull the metal
bar closing the output circuit, allowing a bigger current to flow through it.
How many types of relays are there? - Answer Single Pole Single Throw (SPST) 4 Terminal
Single Pole Double Throw (SPDT) 5 Terminal
Double Pole Single Throw (DPST) 6 Terminal
Double Pole Double Throw (DPDT) 8 Terminal
What is the switch? - Answer It's device that for making or breaking the connection in a
electrical circuit.
How does a switch work? - Answer When it's off, it cuts off the circuit.
What is a transformer? - Answer An apparatus that reduces and increases the voltage of an
alternating current.
How does a transformer work? - Answer It's an electrical device that takes electricity of one
voltage and changes it into another voltage.
What is the symbol for a transformer? - Answer
What is a coil? - Answer It's wires that is wrapped around a magnet of a transformer.
How does a coil work? - Answer When electricity flows through the wires, it creates a
magnetic field, which creates a current.
What is a diode? - Answer A specialized electronic component with two electrodes called
anode(current flows in) and cathode(current flows out).
What is a rectifier diode do? - Answer It only allows an electrical current to flow in one
direction and is mainly used for power supply operation. They can hold higher currents than
regular diodes and can change AC current to DC current.
What is the relay? - Answer It's an electrical device that incorporates an electromagnet, that
is activated by a current or signal in one circuit to open or close another circuit.
How does a relay work? - Answer When power flows through the first circuit, it activates the
electromagnet which creates a magnetic field around the coil. This magnetic field pull the metal
bar closing the output circuit, allowing a bigger current to flow through it.
How many types of relays are there? - Answer Single Pole Single Throw (SPST) 4 Terminal
Single Pole Double Throw (SPDT) 5 Terminal
Double Pole Single Throw (DPST) 6 Terminal
Double Pole Double Throw (DPDT) 8 Terminal
What is the switch? - Answer It's device that for making or breaking the connection in a
electrical circuit.
How does a switch work? - Answer When it's off, it cuts off the circuit.
