DP Physics (last assessment 2024)

Question 20N.2.HL.TZ0.9b(i)

b(i).

[Maximum mark: 2]

20N.2.HL.TZ0.9b(i)

The diagram shows an alternating current generator with a rectangular coil rotating at a constant frequency in a uniform magnetic field.

The graph shows how the generator output voltage $V$ varies with time $t$ .

Electrical power produced by the generator is delivered to a consumer some distance away.

(b(i))

The average power output of the generator is $8.5 \times 10^{5} W$ . Calculate the root mean square (rms) value of the generator output current.

[2]

Markscheme

$V_{rms} = \frac{25 \times 10^{3}}{\sqrt{2}} « = 17.7 \times 10^{3} V »$ ✓

$I_{rms} = \frac{8.5 \times 10^{5}}{17.7 \times 10^{3}} = 48 « A »$ ✓

Examiners report

Generally well answered.

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