Page 96 - Physics_Form_2

Physics for Secondary Schools

Revision Exercise 2 (i) 1Ω (ii) 0.8 Ω
(iii) 1.7 Ω (iv) 0.4 Ω
1. For each of the items (i) - (iv), choose
the correct answer among the given (v) 0.2 Ω
alternatives and write its letter. (c) What is the power dissipated in

(a) The given circuit diagram the resistor in revision exercise
6 FOR ONLINE READING ONLY
in Figure 2.65 is for the 1 (b) when the applied voltage
experiment to determine the is 5 V?
equivalent resistance of two (i) 5 W (ii) 10 W
resistors connected in series. (iii) 15 W (iv) 20 W
The components X, Y and Z (v) 25 W
shown in the circuit respectively (d) Three resistors: R = 3 Ω, R =
1
2
represent. 6 Ω, and R = 9 Ω are connected
3
in series and to a 36 V battery as
shown in Figure 2.67. What is
X the ammeter reading when the
R R switch is closed?
1 2
Z R R R
Y 1 2 3

Figure 2.65
(i) Rheostat, resistor, ammeter
(ii) Voltmeter, ammeter, rheostat
36 V
(iii) Ammeter, voltmeter, rheostat
(iv) Rheostat, ammeter, voltmeter Figure 2.67
(b) The electric current as a function (i) 6 A
of voltage across a resistor is (ii) 5 A
presented by the graph in Figure (iii) 4A
2.66. What is the resistance of
the wire? (iv) 2 A
2. A child, while inserting an electric
I(A) plug into the socket, did not see that
7
there was a thin piece of aluminium
5 foil stuck between the pins of the
4 plug. When he turned the switch on,
3 he noticed a spark at the plug, and at
2 the same time, the lights went out.
1 What could have happened to cause
0 1 2 3 4 5 6 7 8 910 V(V) the spark and to make the lights go
Figure 2.66 out?

90
Student’s Book Form One

Physics Form 2 Final.indd 90 25/10/2025 10:26