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Download Electricity Lab (Virtual) Part 1. To investigate Ohm`s Law V= I R V
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Transcript
Electricity Lab (Virtual) Part 1. To investigate Ohm's Law V= I R V-battery Voltage in Volts, R-electrical Resistance in Ohms, I-electrical current in amps V=IR and R. divide both sides of this equation by R to get a new equation for I in terms of V Write New Equation here: I=V/R Click on the button at right to open ohm's law simulator. 1. What happens to I when V increases? ____it increases___________ What happens to I when V decreases?___it decreases____________ What happens to I as V doubles?_____I doubles__________ What happens to I as V halves?_____I halves___________ What happens to I as V triples?_____I triples___________ What happens to I as V drops to one-third?_____decreases 1/3___________ 2. What happens to I when R increases? ___decreases____________ What happens to I when R decreases?_____increases__________ What happens to I as R doubles?_______halves_________ What happens to I as R halves?______doubles__________ What happens to I as R triples?_____drops to one-third___________ What happens to I as R drops to one-third?_____triples___________ 3. For a battery voltage of 6.0 V what current will you get with a 100 Ohm resistor? (mA means milliamp……..1000 mA = 1 A) I= ____60 mA or 0.06Amps______________ 4. For a battery voltage of 6.0 V what resistor is needed to limit the current to 10 mA (0.010 A) ? R= ___600 ohms_____________ 5. What battery voltage is needed to cause 30 mA (0.030A) to flow through a 100 Ohm resitor? V=______3_V_________________ Part 2. To investigate Electrical Resistance R of a wire. R: Resistance in Ohms : resistivity of the wire's material in Ohms-cm (Glass is large copper is small) L: wire length A: cross sectional area of the wire. Click on the button at right to open Resistance simulator. In your own words explain how the resistance of a wire changes with , L, and A. Increase in L equals increase in R. Increase in equals increase in R. Increase in A is decrease in R. Two Tungsten light bulb filaments of identical lengths are connected to a household circuit of 120 V. Filament A is thicker than Filament B. Which filament has the largest electrical resistance? A or B circle your answer When connect to 120 V, which filament has the largest electrical current? A or B Which filament will glow brightest in your home? A or B If one is rated 40 Watts and the other 100 Watts, which one is the 40 Watt bulb? A or B