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TUTORIAL 1-BENP 2183
FAKULTI KEJURUTERAAN ELEKTRONIK DAN KEJURUTERAAN KOMPUTER
BENP 2183 - PRINCIPLES OF ELECTRICAL AND ELECTRONIC
TUTORIAL 1
1. List the three basic functions of electronic instruments.
2. List three advantages that electronic instruments have over electrical instruments.
3. A current through a resistor is 1.5A, but measurement yields a value of 1.46A. Compute
the absolute error and the percentage of error of the measurement.
4. An average value of a set of voltage measurement is 30.15V. Calculate the precision of
the measurement if one of the measurement readings is 29.9V.
5. A voltmeter has an accuracy of 98% in full-scale measurement readings.
a. If the voltmeter gives measurement reading of 175V at range of 300V, calculate
the absolute error of the measurement.
b. Calculate the percent error for the reading in (a).
6. Two resistors were selected from a supply 2200  10%  resistors.
a. Assume both resistors are 2200  0%, compute the expected resistance of the
parallel resistors combination.
b. Assume both resistors are 2200 + 10%, compute the expected resistance of the
parallel combination. What is the percent error when compared to result in (a)?
c.
Assume both resistors are 2200 - 10%, compute the expected resistance of the
parallel combination. What is the percent error when compared to result in (a)?
7. The expected value of a resistor is 570. The measurement of the resistor gives a value
of 568.4. Calculate:
a. Absolute error.
b. % error.
c.
Relative error.
d. % of accuracy.
8. The diameter of a copper wire has uneven measurements and has been recorded as
follows:
No.
Diameter (mm)
1.
2.21
2.
2.18
3.
2.2
4.
2.21
5.
2.17
6.
2.19
a. Calculate the precision of each measurement.
b. Calculate the precision average.
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TUTORIAL 1-BENP 2183
9. The output voltage of an amplifier was measured at eight different intervals using the
same digital voltmeter with the following results:
20.00, 19.80, 19.85,20.05, 20.10, 19.9, 20.25, 19.95 V
Which is the most precise measurement?
10. An ammeter is specified as being accurate to 0.1 % of its full-scale reading. If the 50 mA
scale is used to measure currents of:
a. 20 mA
b. 40 mA
What is the error in the readings? Assume errors due to temperature variations are
negligible.
11. A 0- to 50- mA ammeter has an accuracy of 0.5 %. Between what limits may the actual
current be when the meter indicates 13 mA?
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