Topic 3: Electric Current & Direct Current Circuit (1st hour)

1. Which of the following is the charge carrier in metal

• ions

• electron

• proton

• neutron

2. The total amount of charge that passes through a wire's full cross section at any point per unit of time is referred to as

• a current

• electric potential

• voltage

• resistance

3. Which of the following will cause through an electrical circuit of  current to decrease?

• constant the voltage

• decrease the resistance

• constant the resistance

• increase the resistance

4. What is 1  Ω equivalent to?

• 1 J/s

• 1 W/A

• 1 V A

• 1 V/A

5. If the length of a wire increases, the resistance ____________

• decreases

• increases

• stays the same

• unknown

6. What effect does a hotter temperature have on resistance?

• No effect

• Increases resistance

• Decreases resistance

• Stays the same

7. Consider two copper wires. One has twice the length of the other. How do the resistivity of these two wires compare?

• Both wire have the same resistivity.

• The longer wire has twice the resistivity of the shorter wire .

• The longer wire has four times the resistivity of the shorter wire.

• none of the given answers.

8. The resistance of a wire is

• proportional to its length and its cross-sectional area.

• proportional to its length and inversely proportional to its cross-sectional area.

• inversely proportional to its length and proportional to its cross-sectional area.

• inversely proportional to its length and its cross-sectional area.

9. The potential difference between the terminals of a battery when no current flows to an external circuit is referred to 

• emf

• terminal potential

10. What is internal resistance?

• the resistance inside the cell that increases with more current drawn from the cell

• the resistance inside the cell that decreases with more current drawn from the cell

• the resistance inside the cell that remains constant as the current drawn from the cell changes

• the resistance inside each component which increases as more resistances are added in series