Electric Current and Resistance

Topics: Electric current, Electrical resistance, Ohm's law Pages: 3 (722 words) Published: September 28, 2014
Batteries, Resistance and Current
 
“Battery-Resistor”:
Check “show battery” and “show cores”, watch what happens, adjust some variables  
1. 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.  The electrons move because of the battery voltage. The current flows in the opposing direction of the electrons and the electrons flow towards the positive side.  

2. What does the Ammeter (on the left) measure? How is this shown in the sim? The ammeter measures amperes on the bottom left of the simulation. 3. What role do the “green dots” in the resistor play in the sim? What do you think they represent? What does this tell you about the effect of resistors in a circuit? The green dots control the flow of electrons. The green dots put resistance on the flow of electrons. When the green dots (resistance) is turned down the electrons move quicker allowing for the battery to get hotter.  

 
 4. Increase the resistance (# green dots). What affect does this have on temperature? WHY?
It makes the temperature decrease, because the green dots have an increased resistance on the electrons it allows the electrons to move slower, in turn in a lesser quantity per second.  
 
 
5. When the circuit gets hotter, what affect does this have on current? Explain using kinetic-molecular theory. The hotter the circuit, the more the current increases, and allows the electrons to move quite rapidly.  

 
 
 
6. To make the circuit “cold”, what do you need to do? WHY?
To make it colder, decrease the voltage. Because the movement of electrons will decrease making it colder.  
 
 
 
 
7. Describe the relationship between voltage and temperature.
The higher the voltage, the hotter the temperature. The lower the voltage, the lower the temperature.  
 
 
 
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