# Batteries, Resistance, and Current

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Battery, resistance, and current Go to http://phet.colorado.edu/en/simulation/battery-resistor-circuit and click on Run Now. Batteries, Resistance and Current “Battery-Resistor”: Check “show battery” and “show cores”, watch what happens, adjust some variables Why do electrons (blue dots) move? Draw a diagram of the battery, label the flow of electrons. The flow of current (+) is opposite; draw this and note if toward or away from + terminal of the battery. Answer: The electrons move because they experience a electric current force in the wire. The battery causes an electric field and the electrons experience a force due to that field. The current flows in the opposite direction of the electrons and the flow of the…show more content…
To make the circuit “cold”, what do you need to do? WHY? Answer: To make the circuit “cold” we have to adjust the voltage, because the v is proportional to i the current, which is proportional to the temperature. 7. Describe the relationship between voltage and temperature. Answer: The higher the voltage, the hotter the temperature will be. Go to: http://phet.colorado.edu/simulations/sims.php?sim=Ohms_Law “Resistance in a Wire”: 1. In this sim, what variables are you seeing? Write the formula below, and indicate the units used to measure each one. Answer: The variables been shown in the simulater are the voltage, current, and ressistance. V(volts) = I(Ampers)* R(Ohms). 2. Try increasing the resistivity of the resistor, ρ. How does this change the “look” of the resistor? Describe how that relates to the formula you just wrote (direct, indirect relationships, etc.). What happens to the value of “R” (Resistance)? Is this something that can be changed in a resistor that you would buy in a store to use in a circuit? Answer: Increasing the resistivity the resistor gets bigger, which directly effects the current by making it smaller. Indirectly the voltage to push the current through has to be stronger to push the current through. The value of R gets larger, you can change the resistance, but you would have to change out the resistor element to do this. 3. If you