3. Complete the sentences with the correct
form of the words in brackets.
1. Tom returned back home and saw Aunt
Polly, who
(sit) by an open
window.
2. "How much
you
(do)?" she asked.
3. Tom's army
(win) a great vic-
tory in this battle.
4. She
(go) into her house, but
first she
(leave) a flower for
him on the grass.
5. He
(lie) down on the ground
under it, holding his flower.
U1 (5/t) t = U2 (10/t) t
5 U1 = 10 U2
U1 = 2 U2
Напряжение на первом участке вдвое больше, чем на втором.
2. Мощность электродвигателя P = UI = 220 В * 10 А = 2200 Вт. Значит в час он потребляет 2200 * 3600 = 7920000 Вт*ч = 7920 кВт*ч.
Общее время его работы t = 30 * 8 = 240 ч (не будем переводить в секунды). Значит общее потребление Q = Pt = 7920 * 240 = 1900800 кВт*ч.