Higher Electrical Circuits Questions
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1 Higher Electrical Circuits Questions 1. Four resistors are available with values 4Ω, 6Ω, 10Ω and 12Ω. Describe which combination of any of these resistors will produce the combined resistances below: a) 20Ω. b) 3Ω. c) 5Ω. 2. Calculate or find the resistance in the network below between: a) DE. b) EF. c) DF. 3. Calculate or find the resistance between the points C and D in the network below.
2 4. The length of a bare uniform resistance wire is 30Ω. The length of the wire into the shape of a square and the ends are soldered as shown below. Calculate the resistance that the ohmmeter would display if it is connected at the mid-points on opposite sides of the square. 5. A student requires a resistor for an electronics project and its value must lie in the range (11 ± 2)Ω. The only resistors available are 10 Ω. Which of the following combinations of these 10 Ω resistors could be used? 6. Three resistors are connected as shown below. Calculate the total resistance between X and Y.
3 7. Three resistors are connected as shown below. Calculate the total resistance between X and Y. 8. Five resistors are connected as shown below. Calculate the total resistance between X and Y. 9. The circuit below shows resistors connected as a potential divider. Calculate the reading on the voltmeter: a) When the switch is open. b) When the switch is closed. 10. In the following circuit calculate the potential difference across the 12Ω resistor when: a) Switch is open. b) Switch is closed.
4 11. The circuit below shows two resistors connected to a 6V dc supply. Calculate the power dissipated in the 3Ω resistor. 12. In the following circuit, the pd across the 16Ω resistor is 40V when the switch is open. Calculate the pd across the 16Ω resistor when the switch is closed. 13. In the circuit below, each resistor has a resistance of 20Ω. Calculate the voltage across PQ.
5 14. In the following circuit the current from the battery is 3A. Calculate the resistance of the unknown resistor R. 15. Calculate the pd across the 30Ω resistor in the circuit below. 16. Calculate the pd across PQ in the circuit below. 17. A battery of EMF 24V and negligible internal resistance is connected as shown below. The reading on the ammeter is 2.0 A. Calculate the resistance of the unknown resistor R.
6 18. Calculate or find: a) Total resistance in series. b) Current reading on the ammeter. c) Readings on: Voltmeter V 1, Voltmeter V 2 and Voltmeter V 3. d) What do the readings on the voltmeters V 1 + V 2 + V 3 add up to? 19. Calculate or find: a) Total resistance in parallel. b) Readings on ammeters A 4 and A 5. c) Readings on ammeters A 1, A 2 and A 3. d) How do the readings on ammeters A 4 and A 5 compare with the readings on A 1, A 2 and A 3?
7 20. Calculate or find the following from the circuit below: a) Total resistance in series R s. b) Total resistance in parallel R p. c) Total resistance in the circuit R T. d) Reading on the ammeter. e) Reading on the voltmeter. 21. Calculate the reading on the voltmeter V 1 from the circuit below. 22. Calculate or find the following from the circuit below: a) The power developed in the 120Ω resistor when the switch S is open. b) The power developed in the 90Ω resistor when the switch S is closed.
8 23. Calculate or find the following from the circuit below: a) Reading on the ammeter. b) Reading on the voltmeters V 1 and V 2. c) Power dissipated in the 1.8kΩ resistor. 24. Calculate the following from the circuit below: a) The current reading on the ammeter. b) The voltage reading on voltmeter V 2. c) The resistance R Calculate the following from the circuit below: When the switch is open. a) Reading on the ammeter. b) Reading on the voltmeter. When the switch is closed. c) Reading on the ammeter. d) Reading on the voltmeter.
9 26. Calculate the following from the circuit below: a) Total resistance in the circuit. b) The unknown resistance X. 27. Calculate or find the following from the circuit below: a) Total resistance in the circuit. b) Reading on the ammeter A T. c) The voltage dropped across the 38.8Ω resistor. d) The current readings on ammeters A 1, A 2 and A 3.
10 28. Calculate or find the following from the circuit below: a) Resistance R 2. b) A resistor of 9kΩ is then added in parallel to R 2. Calculate the new reading on the voltmeter. 29. A series circuit contains a voltage supply of 5.5V, a resistor and a LED with a voltage of 1.7V dropped across it. Calculate the unknown resistance R if a current of 19mA flows in the circuit. 30. A circuit contains a 6V supply, an ammeter, a 4kΩ resistor and a thermistor at room temperature. Calculate the voltage dropped across the 4kΩ resistor if the thermistor has a resistance of 20kΩ at room temperature.
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