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MODUL • Fizik TINGKATAN 5

2 Mengukur beza keupayaan bekalan kuasa Contoh / Example:
Measuring the potential difference of the power supply
Voltan a.t. / d.c. voltage
V = gandaan-Y × h 1 cm
V = Y-gain × h
h = 2 cm
h = sesaran tegak tompok cahaya
h = vertical displacement of the light spot

–1
Voltan a.u. / a.c voltage Gandaan-Y ditetapkan pada 2.0 V cm .
Y-gain is set at 2.0 V cm .
–1
1
Voltan puncak, V = gandaan-Y× 2 (ketinggian garis Voltan puncak, V = 2.0 V cm × 2 cm

–1
p
menegak) p
1 = 4 V
Peak voltage, V = Y-gain× (height of the vertical line)

p 2 V
V = p = 4 V
1 1 r.m.s.
V = × V V = × V 2 2
p.m.k.d. 2 p r.m.s. 2 p
[ p.m.k.d. punca min kuasa dua ]
V = V = 2.83 V
V r.m.s. = V root mean square
3 Mengukur sela masa yang singkat dan frekuensi Contoh / Example:
Measuring short time interval and frequency
Jarak antara dua denyutan pada skrin = d cm.
The distance between two pulses on the screen = d cm. 1 cm

Kawalan dasar masa = x s cm .
-1
The time-base control setting = x s cm .
-1
d = 4 cm
Tempoh bagi dua denyutan, T = xd
Period for two pulses, T = xd
UNIT 4
[Dalam kes ini, unit T ialah 'saat' Gandaan dasar masa ditetapkan pada x 0.01 s cm –1
=
In this case, the unit of T is 'second' ] The time-base gain is set at x
UNIT 4
Jarak antara dua denyutan pada skrin, d 4 cm
The distance between two pulses on the screen, d =
Oleh itu, tempoh, T 0.01 s cm × 4 cm = 0.04 s
–1
So, period, T =
1
Frekuensi / Frequency, f =
T
1
f = = 25 Hz
0.04 s

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