"Causes of Excessive Current in Household Circuits" Daily Electricity PPT Courseware 2

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"Causes of Excessive Current in Household Circuits" Daily Electricity PPT Courseware 2

On May 5, 2008, a fire broke out in the female dormitory S0601, Student Apartment No. 1 of Minzu University of China, forcing thousands of female students to evacuate the apartment. The Beijing Fire Bureau announced yesterday at National University for Nationalities that the fire was caused by a short circuit in the wiring board that ignited the bedside. The person in charge of the school said yesterday that there were no casualties.

practice

Xiaofang's home has two 40W energy-saving lamps, two 25W incandescent lamps, a 150W TV, and a 650W washing machine. The maximum current allowed by her household electric energy meter is 5A. Can Xiaofang’s electrical appliances be used at the same time? If I purchase another 700W rice cooker, can I use it at the same time?

Known: P1=40W×2 P2=25W×2 P3=150W

P4=650W I=5A P5=700W

Request: Mr. I

Solution: I total = P total/U

P total=P1+P2+P3+P4

=40W×2+25W×2+150W+650W=930W

I total=P total/U=930W/220V=4.2A<5A

Class exercises

1. When classmate Xiao Ming was watching TV at home during the winter vacation, he took out an electric heater to keep warm. When he inserted the plug into the socket, he heard a "pop" sound, and at the same time a plume of black smoke came out of the socket, and the TV and lights also went out... The result of this phenomenon is ()

A. The TV is burned out B. The electric heater is burned out

C. The air switch is disconnected D. The filament is burned out

2. In life, we will encounter these situations: (1) Two wires in the switch collide; (2) Two wires in the plug collide (3) High-power electrical appliances are added to the circuit (4) ) Damage to the insulation of outdoor transmission lines. In the above situation, what may cause the fuse in the household circuit to blow is ( )

A.(1)(2)(3)

B.(2)(3)

C.(2)(4)

D.(1)(4)

3. There are 30 40W electric lamps installed in the teaching building. Now the fuse on the circuit has blown, and the only spare one is a fuse with a rated current of 3A. So the more appropriate approach is ()

A. Make do with one stick

B. Use two wires in parallel

C. Use two wires in series

D. Clamp the fuse to a notch

Keywords: teaching courseware on daily electricity consumption, teaching courseware on the causes of excessive current in household circuits, NEP edition ninth-grade physics PPT courseware, download of ninth-grade physics slide courseware, download of daily electricity PPT courseware, household circuits Download PPT courseware on causes of excessive medium current, in .ppt format

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Update Time: 2024-10-19

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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