Page 165 - Physics Coursebook 2015 (A level)

Chapter 10: Kirchhoff’s laws
2 Figure 10.25 shows a part of a circuit. 2.0 mA
6.5 mA X
4.2 mA
a 2.2 V b
5.0 V
6.3 V 6.3 V
X
2.4 V 2.4 V
Y
Figure 10.25 For End-of-chapter Question 2.
Copy the circuit and write in the currents at X and at Y, and show their directions. [2]
a 2.2 V b
3 Figure 10.26 shows four circuits. Find the unknown potent5ia.0l dVifference (oXr differences) in each case. [5]
1.4 V X
1.4 V c 6.0 V
X
2.4 V d
X
cd
1.4 V X 1.4 V X
6.0 V 2.4 V
Y Y
negligible internal resistance. A high-resistance voltmeter placed across the resistor measures 1.8 V. Calculate:
a the current drawn from the battery [1]
b the p.d. across the lamp [1]
c the total resistance of the circuit [1]
d the number of electrons passing through the battery in a time of 1.0 minute. [4]
(The elementary charge is 1.6 × 10−19 C.)
Figure 10.26 For End-of-chapter Question 3.
4 A filament lamp and a 220 Ω resistor are connected in series to a battery of e.m.f. 6.0 V. The battery has
X
4.3 V 4.7 V 4.3 V 4.7 V
153