Trail Blazing for Electricity

 

 

2.10 Trail Blazing

(Identifying significant variables affecting electric current)

Problem:

Do all wires conduct electric current equally well?

What are the important variables affecting the electric current in an electric path?

Fact: A brighter bulb is a measure of the current

Each of the following questions are proposed for investigation

Write a hypothesis for each.

.11 Does the kind of metal affect the production of a current?

__________________________________________________________

.12 Does the length of the wire influence the current?

__________________________________________________________

.13.What is the effect of the thickness of wire?

__________________________________________________________

Choose the pair of wire coils you would test to investigate your hypothesis (#1, 2, 3 above Write the pair of letters on the blank below)

Hypothesis #

.11 _______ .12 ________ .13 ________

.14 Trail-blazing in the Heat

Problem: [1] How does heat affect the current in the wire?

Fact: The brightness of the light bulb indicates the current flow

Try this:

Circle the light which best shows

the bulb brightness

 

Conclusion: As the wire gets hotter the electric current _______ (increased/decreased)

2.20 Electric Energy Conversion

Problem:If the wire does not conduct current well, what happens?

Try this: from p157

Conclusion:

Electric energy is converted to ____________.