6A

YOUR ANSWER:

Resistance would decrease.

(From P1-2A)

Maybe you didn't understand the question. If a conductor four inches long and one inch in diameter had a

resistance of 8 ohms and we stretched it out to 8 inches, it would be longer. Since the resistance varies directly

with the length and we increased the length, the resistance would have to increase. Also, if we stretched it out, its

diameter would decrease from one inch down to 1/2 inch. Since the resistance varies inversely to its cross-

sectional area and we made the cross-sectional area smaller, we would cause the resistance to become greater or

increase. Now go back to Page 1-2A and choose another answer.

6B

YOUR ANSWER:

To provide a path for the electrons to travel around the circuit.

(From P1-4A)

Outstanding. You're doing fine. Now we know some of the more common types of materials that make

good conductors, such as gold, silver, copper, and aluminum, and the purpose of a conductor. But don't get

carried away with that "good" conductors. There is no such animal as a perfect conductor. All materials offer

some opposition to electron (current) flow. This opposition to current flow is called resistance. Or, stated the

other way, resistance is the opposition offered to the flow of electrons. The unit of measurement for resistance is

the OHM, which is represented by the Greek letter OMEGA, written . In other words, 1 of resistance is equal

to 1 Volt of potential divided by 1 Amp of current: 1 = 1V

1A

Now, which of the following statements is true?

Resistance is a measure of the amount of

current flow in a conductor.

Page 1-15B

Resistance is the opposition to current

flow in a conductor.

Page 1-8A

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