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Intermediate 1 Physics

Intermediate 1 Physics. Practical Electricity. Questions and Answers. Intermediate 1 Physics. Practical Electricity. Questions 1 to 10. Questions 11 to 20. Questions 21 to 30. Questions 31 to 40. Questions 41 to 46. M. V. voltmeter =.

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Intermediate 1 Physics

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  1. Intermediate 1 Physics Practical Electricity Questions and Answers Beath High School - Int 1 Physics

  2. Intermediate 1 Physics Practical Electricity Questions 1 to 10 Questions 11 to 20 Questions 21 to 30 Questions 31 to 40 Questions 41 to 46 Beath High School - Int 1 Physics

  3. M V voltmeter = 1. Draw the circuit symbols for, a voltmeter; an electric motor; a switch and a fuse. electric motor = switch = fuse = Beath High School - Int 1 Physics

  4. A battery supplies energy 2. Beside each of the following symbols write the name of the component and state what it does. lamp changes electrical energy to light energy fixed resistor opposes current and produces heat variable resistor controls current ammeter measures current Beath High School - Int 1 Physics

  5. 3. Draw circuit diagrams showing: (a) a battery, a lamp and two resistors all in series Beath High School - Int 1 Physics

  6. A 3. Draw circuit diagrams showing: (b) a battery, two lamps, a switch and an ammeter all in series Beath High School - Int 1 Physics

  7. 3. Draw circuit diagrams showing: (c) a battery and three lamps in parallel Beath High School - Int 1 Physics

  8. 3. Draw circuit diagrams showing: (d) a battery and switch in series, connected to three resistors in parallel with each other. Beath High School - Int 1 Physics

  9. A 4. Redraw the circuit below showing how to measure the current through the lamp. Beath High School - Int 1 Physics

  10. V 5. Redraw the circuit of question 4 showing how to measure the voltage across the lamp. Beath High School - Int 1 Physics

  11. A A A 6. Write the reading of the ammeters beside each ammeter symbol. 0.9A 0.9A 0.9A Beath High School - Int 1 Physics

  12. V 7. Redraw the circuit of question 6 without the ammeters and show how you would connect a voltmeter to measure the supply voltage Beath High School - Int 1 Physics

  13. 8. In the circuit below, the lamps are identical and the current through each lamp is 0.6 A. Mark beside each component the value of the current through it. 0.6A 0.6A 1.2A 1.2A Beath High School - Int 1 Physics

  14. A 9. In the circuit below the ammeter reads 0.6 amperes. What is the value of the current through the lamp?. 0.6A 0.6A because the current is the same everywhere in a series circuit Beath High School - Int 1 Physics

  15. A2 A1 battery 10. In the circuit below, ammeter A1 reads 0.2 amperes and ammeter A2 reads 0.5 amperes. Beside each component, write its name and the value of the current through it. 0.5A lamp 0.5A 0.5A 0.2A resistor 0.2A heater 0.3A Beath High School - Int 1 Physics

  16. V A2 A1 11. Redraw the circuit of question 10 and show how the voltage across the lamp can be measured. Beath High School - Int 1 Physics

  17. V 8.0V 12. In this circuit, the lamps are different. The voltmeter reads 3 volts. What is the voltage across the other lamp L2? L2 reading = Vsupply – Vlamp1 3.0V = 8.0V – 3.0V = 5.0V Beath High School - Int 1 Physics

  18. V 13. In the circuit below, the voltmeter reads 4 volts. What is the voltage across the resistor R? the voltage is the same across components which are in parallel. R the voltage across R = 4 volts 4 volts Beath High School - Int 1 Physics

  19. V V Vsupply = 4V + 6V = 10V 14. In the circuit below, the voltages are as shown. What is the voltage of the supply? 4V 6V voltages in a series circuit add up to the supply voltage. Beath High School - Int 1 Physics

  20. V V 24V 15. In the circuit below, the voltages are shown. What is the voltage across the second resistor? 8V Vresistor = 24V - 8V = 16V voltages in a series circuit add up to the supply voltage. Beath High School - Int 1 Physics

  21. 24V 16. This diagram shows a 6 V bulb working correctly off a 24 V supply. What must be the voltage across the resistor? Vresistor = 24V - 6V 6V = 18V voltages in a series circuit add up to the supply voltage. Beath High School - Int 1 Physics

  22. courtesy light 17. The diagram shows the circuit of the courtesy light in a two-door car. A car courtesy light operates when either door of the car is opened. (a) What happens to a switch when a door is opened? (b) Explain why the switches are in parallel rather than in series. S1 S2 The switch closes (and completes the circuit). This means that when either door is opened, the circuit is completed and so the courtesy lamp lights. Beath High School - Int 1 Physics

  23. voltage current resistance = 18. A resistor has a voltage across it of 12 volts and a current through it of 2 amperes. Calculate the resistance of the resistor. 12 = 2 = 6W Beath High School - Int 1 Physics

  24. voltage current resistance = 19. A voltage of 6 volts is across a resistor where the current is 0.5 amperes. What is the value of the resistor? 6 = 0.5 = 12W Beath High School - Int 1 Physics

  25. voltage current resistance = 20. Calculate the resistance of a component when a voltage of 24 V causes a current of 0.1 amperes. 24 = 0.1 = 240W Beath High School - Int 1 Physics

  26. voltage current resistance = 21. If a current of 2 amperes exists through a lamp when it has 12 volts across it, what is the resistance of the lamp? 12 = 2 = 6W Beath High School - Int 1 Physics

  27. voltage current resistance = 22. A torch bulb is marked "6 V, 0.25 A". Calculate the resistance of the bulb. 6 = 0.25 = 24W Beath High School - Int 1 Physics

  28. voltage current 23. A resistor is placed in a circuit. The voltage across it and current through it are measured as 12 volts and 0.02 amperes. The resistor is now removed from the circuit and an ohmmeter connected across it. What is the reading on the ohmmeter? resistance = 12 = 0.02 = 600W Beath High School - Int 1 Physics

  29. V V V 2V 3V 5V 24. (a) Find the values of the resistors in the circuit below. R1 R2 R3 0.25A V 2 V 5 R1 = = = 8W R3 = = = 20W I 0.25 I 0.25 V 3 R2 = = = 12W I 0.25 Beath High School - Int 1 Physics

  30. V V V 2V 3V 5V 24. (b) Calculate the value of the supply voltage. R1 R2 R3 0.25A voltages in a series circuit add up to the supply voltage. so, Vsupply = 2V + 3V + 5V = 10V Beath High School - Int 1 Physics

  31. The human body conducts better when wet. It is therefore more likely that you could be electrocuted, 25. Explain why it is dangerous to operate mains switches with wet hands. and mains voltage can cause a current large enough to kill you. Beath High School - Int 1 Physics

  32. Hold the terminals of an ohmmeter in separate hands. 26. Describe an experiment to show the change in conductivity of the human body when it is dry or wet. Take a reading of the resistance of your body. Wet your hands and repeat the experiment. Your resistance will have reduced showing that your body is a better conductor when it is wet. Beath High School - Int 1 Physics

  33. cable grip e a r t h 27. Draw a sketch of a domestic three-pin plug. Label the wires; live, neutral and earth and state the colours of their insulation. Label the fuse and describe how it works. y e l l o w b r o w n u s e b l u e l i v e n e u t r a l The fuse is a wire which melts and breaks the circuit if too high a current flows. Beath High School - Int 1 Physics

  34. 28. Draw the symbol for a double insulated appliance. Describe what is meant by "double insulated". A double insulated appliance has an insulated casing which cannot become ‘live’. You cannot be electrocuted touching its casing and so it does not need an earth wire. Beath High School - Int 1 Physics

  35. A circuit breaker is faster in switching off a circuit than a fuse is 29. What are the advantages of using a circuit breaker instead of a fuse? • A circuit breaker is easier to reset than rewiring a fuse Beath High School - Int 1 Physics

  36. power current = = voltage 1150 = 5A 230 30. Which fuse value is required for an appliance with a power of 1150 watts? Therefore a 13 ampere fuse is required. Beath High School - Int 1 Physics

  37. power current = = voltage 820 = 3.6A 230 31. A mains appliance has a power rating of 820 watts. How much current does it require? Beath High School - Int 1 Physics

  38. power current = = voltage 2000 = 8.7A 230 32. How much current will a 2 kilowatt mains heater require? Beath High School - Int 1 Physics

  39. power current = = voltage 33. Mains plugs can have a choice of two values; 3 A and 13 A. Which fuse should be inserted in a plug attached to a 750 watt appliance? 750 = 3.3A 230 A 3A fuse would be too low as it would be melted by a current of 3.3A. Therefore a 13 ampere fuse is required. Beath High School - Int 1 Physics

  40. power current = = voltage 34. A lighting circuit in a house serves 6 rooms. If each room can have a maximum of 150 watts per ceiling lamp, what value of fuse should be used to protect the circuit? 6 x 150 230 900 = 230 = 3.9A Therefore a 5 ampere fuse is suitable for this lighting circuit. Beath High School - Int 1 Physics

  41. flexes live 35. Complete the following sentences to make 4 important safety rules for mains electricity. (a) Never use worn or damaged : you could get a shock from an exposed wire. (b) Avoid the use of if possible: too many appliances connected to an adaptor could produce at the socket. (c) Always use the correct flex: a flex which is too could overheat. (d) Always use the correct plug : if the fuse rating is too and a fault develops, the flex could overheat. extensions overheating thin fuse high Beath High School - Int 1 Physics

  42. The circuit is broken (i.e. an open circuit) if the reading is “off scale” (i.e. 1 . ). Set the multimeter to be an ohmmeter (i.e. a resistance meter). 36. Describe how to use a multimeter to detect an open circuit. Make sure you include how to set the multimeter to the correct setting and what you would expect to see for this fault. Connect the ohmmeter to the circuit. Beath High School - Int 1 Physics

  43. 37. The circuit shown below contains a battery, lamp, 1 A fuse and a variable resistor. (a) Is this a series or a parallel circuit? series ; because there is only one path for current. Beath High School - Int 1 Physics

  44. 37. (b)The variable resistor is set so that a current of 2A flows. (i) What happens to the fuse when there is a current of 2 A? (ii) What happens to the lamp when there is a current of 2 A in the fuse? Explain your answer. It melts/breaks/blows. (This is because it allows a maximum current of 1A.) The lamp stops lighting/goes off. This is because, when the fuse melts, the circuit is broken and so the current stops. Beath High School - Int 1 Physics

  45. 38. A group of pupils investigate the time various appliances are switched on for during a day. The appliances are all rated at 100 W. Their results are presented in the bar chart below. (a) Which of the appliances is switched on for the longest time? The lamp, because its bar is the highest. Beath High School - Int 1 Physics

  46. The lamp, 38. (b) All of the appliances have a power rating of 100W. Explain which of the appliances is most costly to use in one day. because, being on for longer, it uses more electrical energy than the other appliances. You should note that a higher powered appliance (like a heater) can cost more to use even if it is on for a shorter time. This is because it is using electrical energy at a faster rate. Beath High School - Int 1 Physics

  47. 39. The following table gives details about various household appliances. (a) Complete the table shown above. (b) List all the appliances in the table which should have a 3 A fuse fitted in their plug. 0.26A 8.7A 7.8A 1.3A The table lamp and the curling tongs. Beath High School - Int 1 Physics

  48. A1 A2 40. Shown below is a parallel circuit containing a battery, resistor, lamp and two ammeters. The following readings are taken from the ammeters: Reading on A1 = 0.05 A Reading on A2 = 0.42 A (a) State the current through the lamp. (b) Which component, the resistor or the lamp, has the larger resistance? Explain your answer. 0.42A the resistor It has a smaller current through it. The current has split with most of it taking the easier path through the lamp. Beath High School - Int 1 Physics

  49. power 4 current = = = 0.017A voltage 230 41. The adverts shown below give information on two music systems. (a) Explain which music system is the more expensive to operate. (b) Both of these systems need to be connected to the mains supply. State the voltage across these systems when connected to the mains. (c) Calculate the current in the ‘Pony’ music system. The VMJ one as it has a higher power rating. 230V Beath High School - Int 1 Physics

  50. 42. A continuity tester is shown. (a) A piece of bare copper wire is connected to both metal probes. Will the lamp light? Yes, because the thick copper has a very low resistance and completes the circuit. Beath High School - Int 1 Physics

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