Download Electricity Lab (Virtual) Part 1. To investigate Ohm`s Law V= I R V

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