Click on the components of the circuit to change their values and explore the relationship between voltage, current and resistance. Fill in the missing values in the table. Add a voltmeter and ammeter to measure voltage and current.
Voltage 
Resistance of LightBulb 
Resistance of resistor 
Total Resistance 
Current 
Results 
9 V 
10 Ohms 
10 Ohms 


Add the resistances in a series circuit to get the total resistance 
9 V 
5 Ohms 
0 Ohms 


When the total resistance goes down the current goes ____ 
12 V 
10 Ohms 
60 Ohms 
70 Ohms 

When the total resistance goes up the current goes ____ 

10 Ohms 
10 Ohms 
20 Ohms 
1.00 Amp 
You need ___ volts with 20 ohms of resistance for 1 Amp of current 

10 Ohms 
10 Ohms 
20 Ohms 
2.00 Amps 
You need ___ volts with 20 ohms of resistance for 2 Amps of current 






With a 9 V battery, how many volts are passing through each lightbulb in the parallel circuit? 

With a 9 V battery, how many volts are passing through each lightbulb in the series circuit? 

If you disconnect one lightbulb, what happens to the other lightbulb in the parallel circuit? 

If you disconnect one lightbulb, what happens to the other lightbulb in the series circuit? 

What is the current in the parallel circuit between the light bulbs?  What is the current in the series circuit between the light bulbs?  
What is the current in the parallel circuit between the battery and a light bulb? 
What is the current in the series circuit between the battery and a light bulb? 

Is the current the same on every wire? 
Is the current the same on every wire? 


Change the battery to 10V, did the current change by much? 
Change the battery to 10V, did the current change by much? 

Change 1 lightbulb to 30 Ohms resistance. Are the bulbs equally bright? 
Change 1 lightbulb to 30 Ohms resistance. Are the bulbs equally bright? 

Label the diagrams of the circuits above with how much voltage there is across each lightbulb and how much current is in each wire with a 10V battery, one 10 Ohm bulb and one 30 Ohm bulb. 
Replace the resistor, with an item from the grab bag. Find out if it's possible to light the light bulb without causing a fire and if so, how many volts will be needed.
Which of the odd items has the most resistance?______________ 

