Name Unit Exercise Teacher’s comment: Class: Marks 13 – ELECTRICITY 16 : Basic electricity Date: CW Checked  Excellent [100%]  Good / Satisfactory [89 – 70%]  Very good [99 -­‐ 90%]  Need improvement [69% below] by HW % Grade : 30 Section A – Choose the best answer and write its letter in the boxes provided. [5] 1.
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Which of the following is a source of electricity? A. Light bulb B. Dry cell C. Switch D. Fuse Which symbol represents a resistor in an electrical circuit? A B C 3.
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D Which diagram shows a complete circuit? Which of the following is correctly matched? Electrical component Function A. Bulb It gives out light and heat energy B. Cell It measures the amount of current in a circuit C. Switch It is a source of electrical energy D. Voltmeter It can be used to close and open a circuit Which statement is not true about electric circuit? A. It must have at least one electrical component including the electrical source. B. It is a closed path through which electric current flow. C. It is an open path through which electric current flow. D. It consists of at least one electrical source. Section B – Answer the following questions in the spaces provided. 6.
Fill in the blanks with the correct words in the following sentences using the given words below: [5] voltmeter closed proton battery dynamo electron switch ammeter a)
Two or more cells put together is called ___________________. b) A complete circuit is also known as a ___________________ circuit. c)
When ___________________ moves from one atom to another in a complete circuit, electricity is produced. d) A ___________________ is used to open or close a circuit. e)
To measure the current in a complete circuit, we use a device called ___________________. LSS Year 8, 2013 1 of 2 unit 13 ex 16: standardised exercise 7.
Write “TRUE” for a correct statement and “FALSE” for an incorrect statement on the following sentences: [5] a)
A bulb will still light up even though the circuit is incomplete. ___________ b) A voltmeter can be used to measure the voltage of a dry cell. ___________ c)
___________ ___________ ___________ A cell is used to give energy to the light bulb. d) Dry cells and generators are examples of electric sources. e)
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The positive terminal of a cell is drawn using a longer line than the negative terminal. Describe the direction of conventional current and electron flow in the following circuit diagrams. Conventional current Electron flow i)
Draw arrows in the circuit diagram to show the direction of conventional current. [1] iii) Describe the direction of conventional current. [1] 9.
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Draw arrows in the circuit diagram to show the direction of electron flow. [1] iv) Describe the direction of electron flow. [1] Draw the circuit symbols for each of the following. [6] a) Bulb d) Rheostat b) Battery e) Voltmeter c) Resistor f) Open switch 10. Draw a circuit diagram for the diagram below. [5] Use pencil and ruler. LSS Year 8, 2013 2 of 2 unit 13 ex 16: standardised exercise