126 Chapter 6 • Electricity


4. Determine the total resistance in each case of three resistors of 15 ohms, 10 ohms and 20 ohms respectively, which are connected in; 4.1 parallel, and 4.2 series.


(4,615 ohms; 45 ohms)


5. Tree resistors with values of 12 ohms, 3 ohms and 6 ohms respectively are connected in; 5.1 parallel, and 5.2 series.


Determine the resistance of the circuit in each case. (1,714 ohms; 21 ohms)


6. Two resistors with values of 6 ohms and 18 ohms respectively are connected in (a) series, and (b) parallel across a 48 volt supply. Determine; 6.1 the resistance of the circuit for each connection, (a) and (b), and 6.2 the value of the supply current in each case.


(24 ohms; 4,5 ohms; 2 A; 10,67 A)


7. A 20 ohm and a 40 ohm resistor are connected in: (a) parallel, and (b) series across a 100 volt supply. Determine; 7.1 the resistance of the circuit, and 7.2 the value of the supply current for each connection. (13,33 ohms; 60 ohms; 7,502 A; 1,667 A)


8. Tree resistors with values of 15 ohms, 20 ohms and 30 ohms respectively are connected in (a) series, and (b) parallel across a 24 volt supply. Determine; 8.1 the resistance of the circuit, and 8.2 the value of the supply current in each case. (65 ohms; 6,667 ohms; series 0,3692 A; parallel 3,6 A)


9. Tree resistors with values of 24 ohms, 12 ohms and 8 ohms respectively are connected in parallel across a 12 volt battery. Determine the total current drawn from the supply.


(3 A)


10. A 12 ohm and a 15 ohm resistor are connected in parallel across a 24 volt supply. Determine; 10.1 the equivalent resistance of the parallel resistors, and 10.2 the current drawn from the supply.


11. Tree resistors of 12 ohms, 8 ohms and 6 ohms respectively are connected in parallel across a 12 volt supply. Calculate; 11.1 the total resistance of the combination, 11.2 the current drawn from the supply, and 11.3 the current flow through the 8 ohm resistor.


(6,667 ohms; 3,6 A)


(2,667 ; 4,499 A; 1,5 A)


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