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Static Current Circuits Applications 100 100 100 100 100 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 Final Jeopardy Calculations Surprise Static 100 Points Question: Static electricity builds up on what type of materials? Answer: Insulators Back Static: 200 Points Question: How do charged objects become neutralized? Answer: They are brought in contact with the ground. Back Static: 300 Points Question: Why does a charged balloon stick to a neutral wall? Answer: The balloon induces a positive charge on the surface of the wall. Back Static: 400 Points Question: Describe how lightning works? Answer: The friction in the cloud builds up enough charge to induce a positive charge on the ground that jumps in the form of a spark when the charge is great enough. Back Back Current : 100 Points Question: Current electricity means that electrons are __________. Answer: flowing Back Current: 200 Points Question: A battery is the source of electrical _________. Answer: energy Back Current: 300 Points Question: Describe what happens to the current if an identical load is added in series with the first load. Answer: The current is reduced in half. Back Current : 400 Points Question: How is current created? Answer: A turbine in a generator spins to create electric flow by some means (steam, wind, water, etc.). Back Back Circuits: 100 Points Question: What is the schematic drawing of a simple circuit with a 4 cell battery, 2 lights in series and a switch. Answer: Back Circuits: 200 Points Question: When lights are connected in parallel branches, how does the total voltage compare to the voltage drop across each light? Answer: They are all the same Back Circuits : 300 Points Question: How must ammeters and voltmeters be connected in a circuit and what do they measure? Answer: Ammeters – in series, measure current in amps Voltmeter – in parallel, measure voltage drop in volts Back Circuits: 400 Points Question: Describe what a short circuit is and what can happen? Answer: A short circuit is a circuit without a load which can lead to electrical fires. Back Back Applications: 100 Points Question: What does a lightning rod do? Answer: Safely transmits the electrons to the ground through the conducting wire. Back Applications: 200 Points Question: Describe how electrostatic spray paint works? Answer: The paint is given a charge and the thing being painted is given the opposite charge so less paint is wasted. Back Applications: 300 Points Question: What electrical device prevents houses or building from catching on fire do to electricity? Answer: A circuit breaker or a fuse. Back Applications: 400 Points Question: How can consumers make informed decisions about what appliance to buy? Answer: Compare their EnerGuide labels. Back Back Calculations: 100 Points Question: What is the resistance of a light bulb if a 6 V battery produces a 0.6 A current through the bulb? Answer: 10 Ω Back Calculations: 200 Points Question: What is the power rating of a toaster if it takes 1 minute and 40 seconds to use 100 KJ of energy. Answer: 1 KW Back Calculations: 300 Points Question: If an electric stove uses 15 000 J of energy to produce 12 000 J of heat, how efficient is the stove? Answer: 80% Back Calculations: 400 Points Question: What does it cost to have a 60 W light bulb on for one entire 30 day month, assume the rate is constant at $0.08/KWh. Answer: $3.46 Back Surprise: 100 Points Question: When you touch a neutral object with a negatively charged rod, what charge does the object get? Answer: Negative Back Surprise: 200 Points Question: How does a Van DeGraff Generator Work? Answer: The rotating belt picks up electrons by friction and transfers them to the metal ball where they can spread out which then transfer to whatever touches it. Back Surprise: 300 Points Question: Why is it better to pay for more expensive florescent light bulbs compared to incandescent light bulbs when they really produce about the same amount of light. Answer: The florescent light bulbs are more efficient so you will save money on your electrical bill in the long run. Back Surprise: 400 Points Question: Name one advantage and one disadvantage of series and parallel circuits? Answer: Series - easy to wire but if one light goes out they all go out. Parallel - more difficult to wire but can control each electrical load individually. Back Final Jeopardy! • Question: • How many joules in 1 KWh? • Answer: • 3 600 000 J Back