Vitek VTC-3516 Specifikace stáhnout pdf (Strana 79)

Design and Applied Technology (Secondary 4-6)

Theme-based Learning

Theme 1 - Case Study of the Motion-Powered Light Torch

This theme-based learning task enables you to

(a) Understand the roles of designers and engineers;

(b) Understand the value of intellectual property;

(d) Be conscious of environmental protection; and

(e) Understand the value of applying appropriate technology to manufactured products.

A. Background

Motion-powered torch, as shown below, converts mechanical energy (human action) instead

of chemical energy (batteries, for example) into light. A user can simply squeeze the torch

handle for light without the need for batteries. The power generation process starts with the

user’s kinetic motion. The motion and the magnet inside the torch react to generate an electric

current for the light. It is an application of the theory developed by Michael Faraday after his

discovery in 1831.

Motion powered torch

Motion-powered torch is more common in bicycles. A torch is connected with one of the

wheels, whose rotation reacts with the torch’s magnet to generate an electric current and light.

A drawback of motion-powered torches is their limited capacity and instability due to

manpower energy.

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Vitek VTC-3516 Specifikace Strana 79