Practical Exam Flashcards
What is a DC Power device?
An electrical device capable of generating a constant voltage.
What are Dual Power supplies used for?
Generating two constant voltages simultaneously, suitable for components requiring different DC voltage supplies.
What is the function of a Function Generator?
To generate AC voltages such as sine, sawtooth, and square waveforms.
What does a Digital Multimeter measure?
DC and AC voltages, currents, and resistance.
What are Voltmeters used for?
To measure DC and AC voltages.
What do Ammeters measure?
DC and AC currents.
What is the purpose of an Ohmmeter?
To measure resistor values.
What is a Cathode Ray Oscilloscope?
An instrument used to measure and display DC and AC voltages and estimate the phase differences between two AC waveforms.
What is a prototyping board or breadboard used for?
A plastic board with metal connections underneath which is used to construct electronic circuits for designing and testing circuits
What do the first two bands of a resistor’s colour code represent?
The first and second digits of the resistor value.
What does the third band in a resistor’s colour code indicate?
The power-of-ten multiplier for the first two digits.
What does the fourth band in a resistor’s colour code signify?
Resistor Tolerance
What is the typical resistance tolerance range for modern resistors?
Between 1% and 5%.
Explain resistance tolerance
Resistor tolerance indicates how precise the resistor value is
1kΩ resistor with a 5% tolerance can be anywhere between 950 Ω and 1050 Ω
Fill in the blank: The colour code for Black is _______.
0
Fill in the blank: The colour code for Brown is _______.
1
Fill in the blank: The colour code for Red is _______.
2
Fill in the blank: The colour code for Orange is _______.
3
Fill in the blank: The colour code for Yellow is _______.
4
Fill in the blank: The colour code for Green is _______.
5
Fill in the blank: The colour code for Blue is _______.
6
Fill in the blank: The colour code for Violet is _______.
7
Fill in the blank: The colour code for Grey is _______.
8
Fill in the blank: The colour code for White is _______.
9
What is the resistor value for the colour bands Brown, Red, Red?
1200 = 1.2 kΩ
What is the resistor value for the colour bands Brown, Grey, Red?
1800 = 1.8 kΩ
What is the resistor value for the colour bands Orange, White, Red?
3900 = 3.9 kΩ
What is the resistor value for the colour bands Yellow, Violet, Green?
4700000 = 4.7 MΩ
What is the power rating of a resistor?
The maximum amount of power a resistor can dissipate This can stop it being damaged and overheated
Equation of Cut-Off Frequency
R /(2pi L) = cut off F
How to double/halve the cut-off frequency?
To double, halve the resistance or capacitance (Keep one constant)
To halve, double the resistance or capacitance (Keep one constant)
How to double/halve the voltage gain?
