CAIE IGCSE Physics 4.5.6.5 Advantages of high-voltage
Practise explaining why electricity is transmitted at high voltage, linking lower current to reduced cable losses and costs.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- link high transmission voltage to smaller current for the same power
- explain that lower current reduces energy wasted in transmission cables
4.5.6.5—Advantages of high-voltage question 1
Fig. 10.1 shows a transformer that consists of two coils P and Q, and an iron core.
Fig. 10.1
There are 200 turns on coil P and 340 turns on coil Q.
A4.0 V a.c. power supply is connected to coil P.
A transformer is used to step up the voltage before electrical energy is transmitted over long distances.
State and explain one economic effect of transmitting electrical energy at a high voltage.
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