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Yr 9 Science Name: ______________________ Electricity Year 9 Science Electricity Topic Test Mark: /50 [1] [1] 1. Moving electric charges are called an electric c__________. 2. What is the charge on the shell of a Van De Graph generator? positive OR negative 3. Rice bubbles jump off the top of a Van De Graph generator, what charge must they carry? positive OR negative [1] 4. Complete the following table: Circuit Component Wire Diagram [1 each] Switch Light Bulb Power Source Resistor Ammeter Voltmeter 5. What happens to the current in a circuit if the voltage decreases? increases OR decreases OR stays the same 6. What is the law called which relates voltage, current, and resistance? O______ Law [1] [1] R Laugesen 1/5 16/07/2008 Yr 9 Science Name: ______________________ Electricity 7. Complete the following table: Name Eg. Distance Voltage Current Resistance Unit Meter Symbol m [1 each] 8. Explain electricity by describing an analogy for voltage, current, and resistance. Electricity is like Voltage is like Current is like Resistance is like [2] 9. Draw a series circuit containing one power supply, one light globe, and one switch which turns the light on and off. [3] 10. Calculate the current flowing in the following circuit: Current = Voltage ÷ Resistance [3] R Laugesen 2/5 16/07/2008 Yr 9 Science Name: ______________________ Electricity 11. What does a ammeter measure? voltage OR current OR resistance 12. What does a voltmeter measure? voltage OR current OR resistance [1] [1] 13. Describe one benefit that parallel circuits have over series circuits? [2] 14. What type of circuit is used for the lights in your home? series OR parallel [1] 15. Why? [1] 16. Draw a circuit containing one power supply and two light globes in parallel. [3] 17. Explain what a short circuit is and why they are dangerous. [3] 18. Explain how a fuse works and how they can protect your home. [3] R Laugesen 3/5 16/07/2008 Yr 9 Science Name: ______________________ Electricity R Laugesen 4/5 16/07/2008 Yr 9 Science Name: ______________________ Electricity 19. Why are circuit breakers used in new homes instead of fuses? [2] 20. Complete the following sentence about AC and DC electricity? A_____________ Current is used for powering our h__________. D_____________ Current is provided by b___________ to power small appliances. [2] [2] 21. Complete the following sentence: Moving e_________ c_______, or c________, is the fundamental source of magnetism. [2] 22. What is the main difference between a permanent magnet and an electromagnet? [2] 23. Propose one alternative source of electrical energy and a benefit it provides. [2] The End R Laugesen 5/5 16/07/2008