Предмет: Физика, автор: Liza20010523

Напряжение в сети 120 В. Сопротивление каждой из двух ламп, включенных в эту сеть, равно 240 Ом. Определите силу тока в каждой лампе при:
а) последовательном соединении этих ламп;
б) параллельном соединении этих ламп.

Ответы

Автор ответа: MashaPutnaj
0
дано U=120 В      R1=R2=240 Ом    I1- ?

a) при последовательном соединении I1=I2=U/(R1+R2)=120/480=1/4=0,25A

б) при параллельном   U1=U2=U

I1=I2=U/R1=U/R2=120/240=0,5 А
Автор ответа: Liza20010523
0
Спасибо!
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Children and watching TV
Watching television is a major activity that influence on children and adolescents. Children in the United states average watch and three to four hours a day. By the time of high school graduation, they will have spent more time watching television than they have in the classroom. Children who watch a lot of television are likely to: have lower grades in school, read fewer books, exercise less, be overweight.
Time spent watching television takes away from important activities such as reading, school work, playing, exercise, family interaction, and social development. Children also learn information from television that may be inappropriate or incorrect. They often cannot tell the difference between the fantasies presented on television and reality. They are influenced by the thousands of commercials seen each year, many of which are for alcohol, junk foods, and toys.
Parents can help by doing the following: don’t allow children to watch long blocks of TV, but help them select individual programs. Choose shows that meet the developmental needs of your child. Children’s shows on public TV are appropriate. Set certain periods when the television will be off. Study times are for learning, not for sitting in front of the TV. Make TV viewing an active process for child and parents