RESISTANCE

Background

Resistors pass some electrical energy but convert some ot it to heat. They are neither conductors nor insulators but somewhere in between.

Materials Needed

2 batteries in holders
1 breadboard
4 wires with washers 		2 light bulbs
push pins 		2 10-Ohm resistors
1 100-Ohm resistor

Procedure

1. Build a simple parallel circuit. Both light bulbs should be lit equally.

2. Break the circuit to one of the lights and reconnect it with a resistor in the path. The resistance of an object is measured in Ohms. The higher the resistance, the more Ohms the object has. Resistors typically have the number ot Ohms marked on them. Start by using the 10 Ohm resistor.

3. With the resistor in the circuit, observe and record what changes have occurred in the two lights.

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

4. Replace the resistor by the 100 Ohm resistbr. What happens?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

5. What do you think would happen if you put a 10 Ohm resistor in BOTH paths?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Try it. What happens?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

Question

You have now learned about 3 types of electrical materials. What are they?

1. _________________________

2. _________________________

3. _________________________