Phys - Current Electricity QUIZ RETAKE

Explain the difference between conventional current flow and electron flow in an electric circuit. (1-2 complete sentences)

Who first hypothesized conventional current flow?

• Thomas Edison

• Benjamin Franklin

• Nikola Tesla

• Michael Faraday

How long will it take for 82 Coulombs of charge to pass through a circuit with a current of 4.5 A? REMEMBER SIG FIGS!

How long will it take for 452 Coulombs of charge to pass through a circuit with a current of 12.5 A? REMEMBER SIG FIGS!

Explain why a thin wire has higher electrical resistance. (1-2 complete sentences)

If the cross-sectional area of a wire is increased, what happens to its resistance?

• It increases

• It decreases

• It remains the same

• It becomes zero

LED bulbs are more efficient than incandescent bulbs because they ______.

• Use more energy

• Emit more heat

• Have a longer lifespan

• Emit less heat

Increasing the wire’s temperature will ______ the resistance of the wire.

• Increase

• Decrease

• Not affect

Which of the following is a benefit of using LED bulbs over incandescent bulbs?

• Higher energy consumption

• Lower heat emission

• Shorter lifespan

• Higher cost

A circuit contains a battery and a resistor. If the resistance of the resistor is doubled while the battery voltage remains unchanged, what happens to the current?

• The current also doubles

• The current stays the same

• The current is cut in half

• The current becomes zero