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MODUL • Fizik TINGKATAN 5

(b) Hubung kaitkan: / Relate:
(i) voltan pada kabel penghantaran dan arus dalam kabel penghantaran
the voltage on the transmission cable and the current in the transmission cable
Semakin bertambah voltan pada kabel penghantaran, semakin berkurang arus dalam kabel penghantaran
As the voltage on the transmission cable increases, the current in the transmission cable decreases

(ii) arus dalam kabel penghantaran dan kehilangan kuasa semasa penghantaran
the current in the transmission cable and the loss of power during the transmission
Semakin berkurang arus dalam kabel penghantaran, semakin berkurang kehilangan kuasa semasa penghantaran
As the current in the transmission cable decreases, the loss of power during the transmission decreases

(iii) arus dalam kabel penghantaran dan kecekapan sistem penghantaran
current in transmission cable and efficiency in transmission system
Semakin berkurang arus dalam kabel penghantaran, semakin bertambah kecekapan sistem penghantaran

As current in transmission cable decreases, effiency of transmission system increase

(c) Pemboleh ubah:
Variables:

(i) Dimanipulasikan / Manipulated : Arus dalam kabel, I / Current in the cable, I
(ii) Bergerak balas / Responding : Kehilangan kuasa, P / Loss of power, P
UNIT 3
(iii) Dimalarkan / Constant : Rintangan kabel, R / Resistance of cable, R

UNIT 3
Memahami teori melalui pendekatan matematik:
Understanding the theory through the mathematical approach:

Kehilangan kuasa, P[$] = (I [$]) R[malar]
2
Power loss, P[$] = (I [$]) R[constant]
2
Kuasa output[#] = Kuasa input[malar] − Kehilangan kuasa[$]
Output power[#] = Input power[constant] – Power loss[$]
Kuasa output[#]
Kecekapan[#] = × 100%
Kuasa input[malar]
Output power[#]
Efficiency[#] = Input power[constant] × 100%

Apabila rintangan kabel, R, tetap, kehilangan kuasa, P, bergantung pada arus dalam kabel, I
When the resistance of cable, R is constant, the power loss, P depends on the current in the cable. I
Semakin berkurang arus dalam kabel, I, semakin berkurang kehilangan kuasa, P (P α I )
2
As the current in the cable, I decreases, the power loss, P decreases (P α I )
2
Semakin berkurang kehilangan kuasa, semakin bertambah kuasa output
As the power loss decreases, the output power increases
Untuk kuasa input yang tetap, kecekapan bergantung pada kuasa output
When the input power is constant, efficiency depends on the input power
Semakin bertambah kuasa output, semakin bertambah kecekapan (Kecekapan α Kuasa output)
As the input power increases, the efficiecny increasses (Efficiency α Output power) Maklumat tambahan:
Additional information:

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03-Physic F5 2018.indd 126 26/08/2019 11:23 AM