Kirchoff's Rules

1981B4.

a) 3A
b) 108 W
c) 6V

1989B3.

a) i. 40 W ii. 20 W iii. 60 W
b) i. 20 V ii. 10 V iii. 30 V
c) 15 V
d) 7.5 ohms

1983B3

a) 5 ohms
b) i. 4/3 A ii. 2/3 A
c) At point B: 10 V, at point C: -10 V, at point D: -2V
d) 40 W

1982B4

a) clock in parallel with the battery, radio in series with a resistor, and together in parallel with the battery.
b) 600 ohms
c) P = .45 W, energy = 27 J for a minute