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Question 18M.2.HL.TZ1.7e

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.2.HL.TZ1.7e
Level HL Paper 2 Time zone TZ1
Command term Describe Question number e Adapted from N/A
e.
[Maximum mark: 3]
18M.2.HL.TZ1.7e

A capacitor consists of two parallel square plates separated by a vacuum. The plates are 2.5 cm × 2.5 cm squares. The capacitance of the capacitor is 4.3 pF. 

(e)

Describe the use of transformers in electrical power distribution.

[3]

Markscheme

step-up transformers increase voltage/step-down transformers decrease voltage

(step-up transformers increase voltage) from plants to transmission lines / (step-down transformers decrease voltage) from transmission lines to final utilizers

this decreases current (in transmission lines)

to minimize energy/power losses in transmission

[3 marks]

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