CAIE IGCSE Physics 4.5.2.2 And Interpret Graphs of E M F Against Questions

Learn how coil position produces a sinusoidal alternating output and how rotation rate changes frequency and period.

Exam points

sketch and interpret the alternating e.m.f. waveform from a rotating generator coil
calculate frequency, time period and revolutions from generator output data
relate coil position and rotation speed to waveform peaks, zeros and frequency changes

[Maximum number: 3]

(a)

Fig. 8.2 is a voltage-time graph showing the output of a simple alternating current (a.c.) generator at times $t_{0}, t_{1}, t_{2}$ and $t_{3}$ .

Fig. 8.2

Fig. 8.3 is an end view of the plane of the coil of the generator at time $t_{0}$ . The coil is rotating clockwise.

Fig. 8.3

[ 3 ]

(i)

Draw an end view of the position of the plane of the coil at time $t_{1}$ . Include the labels A and B .

[ 1 ]

(ii)

Draw an end view of the position of the plane of the coil at time $t_{2}$ . Include the labels A and B .

[ 1 ]

(iii)

Draw an end view of the position of the plane of the coil at time $t_{3}$ . Include the labels A and B.

[ 1 ]

All question bank results loaded