Vocabulary

I. Learn the words and expressions.

Fractions Decimal fractions Common fractions Numerator Denominator Zero 0 Point	дроби десятичные дроби простые дроби числитель знаменатель нуль нуль точка
2 two sevenths 7 three and a half five and a seventh 6 six and five sevenths	0.002 - zero point two zeros two 1.1- one point one 5.36 - five point three six 65.57 - sixty-five point five seven

I. Read these common and decimal fractions:

1/3 2/5 5/8 7 1/2 9 5/8 15 8/9

0.23 0.009 10.01 205.35 79.31 0.0003

Практическая работа № 4

OHM'S LAW

Цели: Введение и активизация в речи лексики по теме «Закон Ома».

Оборудование: комплект тестов, раздаточный материал.

Vocabulary

I. Learn the words and expressions.

Current электрический ток

Resistance сопротивление

Voltage вольтаж, напряжение

To suppose предполагать

Law закон

R = Resistance equals voltage divided by current.

I = Current equals voltage divided by resistance

V = IR Voltage equals current times resistance.

I. Solve the following problems and read them.

Model: - How much is 10 times 4?

• 10 times 4 equal 40.

1)7x7 = 5)350x2 = 9)49:7 = 13)20.25x30

2) 2.5 x 3 = 6)3.5x10 = 10) 75 : 25 = 14) 7.5 : 5 =

3)10,050x2 = 7) 2,000 x 5 = 11)3,500:35= 15)40.8:4 =

4)100x0.5= 8)0.12x2 = 12)10.25:10= 16) 15.5 : 3=

II. Solve the following problems using the formulas of Ohm's Law.

Model: - Current equals 5 amps; resistance equals 10 ohms. How m the voltage?

- Voltage equals current times resistance. 5 x 10 = 50 V

1) R = 80 ohms 2) R= 10.25 ohms 3) V = 50.05 V

V= 55V I = 35 amp I = 120 amp I =? V =? R =?

4) 1 = 10,500 amp 5) V = 20.05 V 6) I = 0.24 amp

V= 2,000 V R = 0.015 ohm R= 1.36 ohms R =? I =? V =?