Section 2

Question 1

Explain how a carbon-zinc dry cell produces a voltage difference between the positive and negative terminals.

Answer 1

chemical reaction causes negative charge on zinc container and a positive charge on carbon rod.

Question 2

Identify two ways to increase the current in a simple circuit.

Answer 2

Increasing the voltage difference or decreasing resistance

Question 3

Compare and contrast the flow of water in a pipe and the flow of electrons in a wire.

Answer 3

The larger the diameter of pipe or wire, the greater flow of water or electrons.

Question 4

Explain how the resistance of a lightbulb filament changes after the light has been turned on.

Answer 4

A lightbulb filament heats up as an electic current flows through it

Question 5

Net movement of electric charges in a single direction

Answer 5

Electric current

Question 6

Related to the force that causes electric charges to flow

Answer 6

Voltage difference

Question 7

A closed path that electric current follows

Answer 7

Circuit

Question 8

The tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy and light

Answer 8

Resistance

Question 9

Current in a circuit equals the voltage difference divided by resistance.

Answer 9

Ohm’s law

Question 10

Compare and contrast a current traveling through a circuit with a static discharge.

Answer 10

Both movement of electrons from the negative to the positive. circuit has a continuous current. A static discharge is noncontinuous transfer of charge.