Positive effect: The most affect by having a TV is people can gain much more information from the simplest way—watching TV. Most people enjoy watching TV, because it gives us such a lot of fun and helps.
Negative effect: We know if people often spend too long on television the eyes’ tissue will be damaged by the radiation, which release from the TV screen. Finally people need to wear glasses and give people many troubles (e.g. sport, drive car .etc).
Economic effect: A lot of businesses can advertise on TV and add value of their products. As a result of this many firms can make more profit and decrease unemployment in the country that good for a country economic growth.
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Fire alarm and Industry: Fire alarm, which is a bell or other device that gives people warning of a fire in a building like in factory, because in these industries fire can be made esily. Such as some chemical industries, they often have highly combustible materials. Alarm consists of a heat sensor, which is an n.t.c types thermistor (normally) a transistor and an alarm. When light the fire the resistances of LDR decrease and the alarm switch on as transistor switch on.
Positive: It can save a lot of lives and reduce the loss by the fire. It’s an extensive application product.
Negative: Fire alarm is a sensitive system. Sometimes the alarm switches on just only some smoke go through it. So it can make a panic and reduce the confidence in people.
Environmental effect: Combustion reactions produce large amount of CO2 which absorb long wavelength radiation emitted for the Earth’s surface, the average temperature of the Earth increases. This is what we call greenhouse effect.
Calculator and shops/offices: Scientists use the transducer that change electrical energy into light and used as numerical indicators in calculator. It consists of seven segments arranged as the diagram shown on the right so that the digits 0 to 9 can be displayed when different segments are energized. People install the mathematics formulas in the circuit board and calculate by processing binary number, in the end the answer will be displayed on the plasma screen.
Positive effect: Calculator improves the accurate of annual calculation and has high calculation speed. This technology improves people work efficiency and gives plenty of conveniences in business.
Negative effect: It can make mistake sometime, so it also can create countless loss. People always relay on the invention of the calculator and become lazier to do mathematics works on paper than before.
Social effect: Calculators have now become an essential piece of equipment to perform maths.
Mobile phone and communication: Mobile phone receives the information from satellites by electric waves and transfers to sound. As the same theory when you call somebody, the mobile phone transfers your sound to special signals and sends these signals to the satellites.
Positive effect: Information can be communicated quickly by using mobile phone. It saves lots of time, which can make people to do other things. Because its mini size, people can carry it easily and gives us a lot of conveniences.
Negative effect: The information transport by electric wave. So it produced radiation around the mobile phone. The tissues of human’s brain can be damage by the radiation. The health of users can be influenced seriously and we cannot under-estimation this influence.
Economic effect: High communicate speed can induce high efficiency which means the people in business can have higher productivity and reduce the average total costs for the business.
Social effect: People communicate very well by using mobile phones and improve the relationship between everybody. So our society becomes more friendly and peaceful.
