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Practice 1 :resistance Vtotal=ItotalRtotal Vx=IxRx

1. . Find the total resistance of the following combinations of resistors in unit ohm

a.32Ω b.36Ω c .10Ω d.4Ω e.6 Ω f.6.7Ω g. 2Ω h.3Ω I .18Ω j. 72Ω

k .23.75Ω l 13Ω n.167Ω

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2. Calculate the total resistance between X and Y for the following combinations of resistors.

(a) 25 Ω (b) 25 Ω (c) 24·2 Ω (d) 13·3 Ω (e) 22·9 Ω (f) 14·7 Ω.

3 Calculate the values of the readings on the meters in the following circuits.

(a) I = 0·1 A (b) I = 0·5 A, V = 4·5 V (c) I = 2 A, V = 10 V

4. Calculate the unknown values R of the resistors in the following circuits.

6. (a) 5 Ω (b) 6 Ω
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Practice 2
potential difference
1. In each of the following circuits, the “potential” at various points is shown. For each circuit, determine
the “potential difference” between points X and Y

(a) 12 V (b) 8 V (c) 6 V (d) 0 V

Practice 3
Current and Voltage in Series Circuits
Helpful Hint The rules for series circuits are:
1. the current is the same at all points in the circuit
2. the voltage of the source is shared amongst the components in the circuit.

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1. 5 V 2. 3 V 3. (a) 24 V (b) 3 A 4. (a) 0.05 A (b) 10 V 5. (a) 0.2 V (b) 1.7 A
Practice 4 Current and Voltage in Parallel Circuits

Helpful Hint The rules for parallel circuits are:

1. the voltage is the same across all the components in parallel.
2. the current from the supply is shared amongst the different branches of the circuit

1.(a) 12 V (b) 12 V(c) 0.5 A 2. (a) 6 V(b) 0.4 A 3. (a) 230 V(b) 0.6 A (c) 0.9 A
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4 a.24Ω b.54A c. 8V 4V 5.909Ω 6. a.10V b.4V 7 I=4A R=1.5 Ω
8.a.Rtotal =3Ω b I=8A c 2A,6A 9a 24Ω b) 0.5A c)4V d)0.1A 0.4A
10 current 0.25A for24Ω and 36Ω . current 0.15A for 20Ω . current 0.1A for30Ω
12. 30 Ω 13a 4Ω b 8A c 72V