Page 171 - Physics Form 5 KSSM_Neat

Activity 4.15 STEM CPS ICS CHAPTER 4

Aim: To construct a functional prototype current generator (dynamo) by modifying an electric motor

Instructions: Electromagnetism
1. Carry out this activity in groups.
2. Compare and contrast the structures and working principles Note
KEMENTERIAN PENDIDIKAN MALAYSIA
of the direct current motor and the direct current generator. Use the K-W-L strategy data form
3. Gather and study the following information from reading
materials or websites:
SCAN ME
(a) the method of converting a motor to a dynamo SCAN ME
(b) the ways to produce rotation in a dynamo K-W-L Data
Strategy Form
4. Based on the information you studied, suggest a design for the
prototype dynamo and the way to operate it. http://bit.ly/301Sucu
5. Construct the dynamo by modifying electric motor according
to the suggested design and test the dynamo.
6. From the results of testing the dynamo, discuss the improvements that need to be made.
7. Make the improvements to the prototype dynamo and test the dynamo again.
8. Present the design of your dynamo.

Formative Practice 4.2

1. What is the meaning of electromagnetic induction?

2. (a) State Faraday's law.
(b) Use Faraday's law to explain the effect of the speed of rotation of the coil on the
magnitude of the induced e.m.f. in a current generator.

3. Figure 4.30 shows a simple pendulum with a bar magnet
as the bob oscillating near a copper ring.
(a) Explain the production of current in the copper ring when Copper
the bar magnet is moving towards the ring. ring
(b) At the position of the observer in front of the ring as S
shown in Figure 4.30, state whether the current in the N
copper ring is clockwise or anti-clockwise.
(c) Explain the effect of the current in the copper ring Observer
on the motion of the bar magnet. Figure 4.30

LS 4.2.4 161