Electrical Devices Lab Report

Tran Nguyen Quoc Tuan
12A
SPECIAL INVESTIGATION: EXAMINATION OF AN ELECTRICAL DEVICE
Introduction
Electrical devices play a vital role in our daily life. They provide a lot of useful functions in life so we use them everyday since the technology doesn’t stop developing. We use them in cooking foods, boiling water, cooling when we’re sleeping, lighting we’re going to the dark area, etc. We just know that as we plug them in the socket to get electricity, we will operate and serve for our own purposes but we don’t know that what are the main components of them and how those components associate together to function properly. Thus, the report is carried out with the aim to investigate what are the main components of some popular electrical devices

As the current passes through the light bulb, the light bulb will glow brightly. The bedroom lamp usually uses 2 main types of light bulb which are incandescent and fluorescent light bulb but the fluorescent is preferred since this type consumes less energy and has smaller amount of heat loss comparing to incandescent. The fluorescent light is filled with small amount of mercury. As the current passes through the bulb the free electrons will interact with mercury molecules. Those molecules become excited and having been inspired with energy due to the impact. The free electrons return to their normal state very quickly and release extra energy in form of light. As the light is emitted, the lampshade which covers the bulb will soften the light from the light bulb and reduce the glare. The lampshade also focuses the light from light bulb in a desired

The minimum current a human can feel is thought to be about 1(mA). The current may cause tissue damage or fibrillation if it is sufficiently high. Death caused by an electric shock is referred to as electrocution. Generally, maximum currents approaching 100 (mA) are lethal if they pass through sensitive portions of the body
When human skin is dry, the current passes through the human body is:
I= V/R = 220/100000 = 0.0022 A
In dry condition, the current causes tissue damage or fibrillation as a malfunction of the device occurs
When human skin is wet, the current passes through the human body is:
I= V/R = 220/1000 = 0.22 A
In wet condition, user could be in danger, the current is very high and causes a significant electric shock and user could be electrocuted. This is because water is able to conduct electricity

For safety features, bedroom lamp has fuse, insulating cover and