Electricity and Electronics Flashcards
Which equation do we tend to use to compare the power of resistors that are connected in series?
P= I^2 R
Which equation do we tend to use to compare the resistors that are connected in parallel?
P= V^2/ R
What is direct current?
Current flowing in one direction
What is alternating current?
Changes direction
What is a variable resistor?
It is a controlled resistor and it is used as volume control and as potentiometer- controls the current.
What does a diode do?
Allows current to flow in one way only
How should the diode be placed for the circuit to work?
The straight line should be on the side of the negative - terminal of the battery
What is diode made to do?
Change ac to dc by rectification
What are short circuits?
Is a low resistance path for the current to follow
What is the earthing wire used for in our homes?
Safety precautions to prevent electric shock
What are dangers of electricity?
Damaged insulation
Overheating of cables
Damp conditions since water is a conductor
What is a transducer?
A device for converting a non-electrical input into an electrical signal
What does the input sensor do?
Detects changes in the environment and converts them to electrical signal
Give examples for input devices
Thermistor
LDR
Thermocouple
Give examples for output devices
LED’s
Heater
Bell
Loudspeaker
What are analogue signals?
Handled information which is represented by continuous change and flow, such as voltage and current
What are digital signals?
Represent data in discrete units
Give the truth table for an OR gate
0 1 1
1 0 1
1 1 1
0 0 0
Give the truth table for an AND gate
0 0 0
0 1 0
1 0 0
1 1 1
Give the truth table for a NOT gate
0 1
1 0
Give the truth table for a NAND gate
0 0 1
1 0 1
0 1 1
1 1 0
Give the truth table for a NOR gate
0 0 1
1 0 0
0 1 0
1 1 0
Draw on a piece of paper ALL of the logic gates
