Айнымалы ток тізбегіндегі қуат. Орташа қуат. Есептер шығару. Физика, 11 сынып, қосымша материал 2.

1aT [1]0.1 s [1]

bit 0, 0.05 and 0.15[1]

iit of a period[1]t 0.025 s[1]

iiit 0.075 s [1]

ivt sin (20πt)[1]t 0.0125 s[1]

2aCorresponding parts of each wave occur at the same time.[1]

bPower P always positive.[1]Two peaks for P in time taken for one peak of I and V.[1]Sinusoidal shape above axis.[1]

3aiI [1]I_rms 3.0 A[1]

iiI_peak 3 4.2 A[1]

iiiV_peak 230 325 V[1]

bCorrect shape all above axis.[1]

Two cycles shown (i.e. one cycle of current waveform).[1]Peak and average power marked.[1]

4aa.c.[1]

Current is positive and negative OR current flows one way, then the opposite way.[1]

bVoltage switches between 2 and 2 V. Power is , so it has the same value for both positive and negative values of the voltage.[1]

ci2 V[1]

ii 2 V[1]

5Average power [1] 7.5 W[1]

6aiPeriod 80 ms 0.080 s[1]f 12. 5 Hz[1]

iiPeak voltage 4.5 V[1]r.m.s. voltage 3.2 V[1]

bV₀ 4.5 V[1]ω 2πf 2π 12.5 78.5 s⁻¹ 79 s⁻¹[1]