Page 166 - Physics Coursebook 2015 (A level)

Cambridge International AS Level Physics
5 The circuit diagram in Figure 10.27 shows a 12 V power supply connected to some resistors. 12 V
X
Y
Figure 10.27 For End-of-chapter Question 5.
The current in the resistor X is 2.0 A and the current in the 6.0 Ω resistor is 0.5 A. Calculate:
a the current in resistor Y [1]
b the resistance of resistor Y [2]
c the resistance of resistor X. [2]
6 a
b Figure 10.28 shows a circuit containing batteries and resistors. You may assume that the batteries
Explain the difference between the terms e.m.f. and potential difference. [2]
have negligible internal resistance.
E1 1.75 A
1.00 A
E2
Figure 10.28 For End-of-chapter Question 6b.
i Use Kirchhoff’s first law to find the current in the 4.00 Ω and 8.00 Ω resistors. [1]
ii Calculate the e.m.f. of E1. [2]
iii Calculate the value of E2. [2]
iv Calculate the current in the 12.00 Ω resistor. [2]
4.00 Ω
6.0 Ω
8.00 Ω
3.00 Ω
12.00 Ω
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