Page 55 - Physics_Form_2

Current electricity

Example 2.4 The total current flowing in the

In the circuit shown in Figure 2.17 the circuit is 6.17 A.
battery has a voltage V = 10 V, (b) The current flowing through each
4
R  , R  , R  6. resistor is given by;
5
1
2
3
V V V
FOR ONLINE READING ONLY
I = 1 R 1 , I = 2 R 2 and I = 3 R 3
10 V 10 V
V R 1 R 2 R 3 I  1 4   2.5 A; I  2 5   2A

10 V
and I  3  1.67 A
6 
Figure 2.17
The current flowing through R is
From the given circuit, find: 2.5 A, R is 2 Aand R is 1.67 A.
1
(a) Effective resistance and total current 2 3
flowing. (c) The total current flowing through
(b) Current flowing through each the circuit is,
resistor.
(c) Sum of currents flowing through the I = I + 1 I + 2 I 3
circuit.
I = 2.5 A 2A 1.67 A+ +
Solution = 6.17 A

Given V = 10 V, R  , The total current flowing through
4
1
5, R 
R  3 6; the circuit is 6.17 A.
2
Required to find the total resistance R T . Example 2.5
Using: Determine the current reading on the

1 1 1 1 ammeter in the circuit shown in Figure
(a) = + +
R T R 1 R 2 R 3 2.18.

9 V
1  1  1  1  37
R T 4  5  6  60 

R  T 1.62  15 Ω 20 Ω
Total current, I, is given by 24 Ω 6 Ω
V 8 Ω 3 Ω
I =
R T 12 Ω
10 V 6 Ω
  6.17 A
1.62  Figure 2.18

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Physics Form 2 Final.indd 49 25/10/2025 10:26