Physics Review Quiz

If the potential difference across the bulb in a campaign lantern is 9.0 V, what is the potential difference across the battery used to power it?

• 4.5 V

• 6.0 V

• 9.0 V

• 12.0 V

Which change can result from a current moving through a copper conductor?

• A decrease in voltage

• A decrease in resistance

• An increase in temperature

• An increase in wire length

What happens to a current when the electric field in the wire increases?

• The drift velocity decreases

• The electrons move randomly

• The drift velocity increases, and the number of electrons passing through a cross section of wire increases

• The voltage becomes negative

What are two ways that resistance can be increased by changing a wire?

• Increasing width and decreasing length

• Decreasing width and voltage

• Increasing the wire’s length and decreasing the wire’s width

• Lowering the voltage and temperature

Why can the energy stored in a battery be considered electrical energy?

• It produces light in the circuit

• It stores thermal energy

• The energy gives rise to a potential difference

• The battery heats up

An electric circuit is made using copper wire. The circuit is rebuilt repeatedly using thinner copper wire each time. What happens to the electron flow in the circuit as the wire becomes thinner and thinner?

• The electrons stop moving

• The electrons move less easily through the wire

• The electrons move more quickly

• The current stays the same

Which one describes the speed of an electron moving in an electric field in a conductor?

• Electrical speed

• Random velocity

• Drift velocity

• Electron pace

How would the current running through a resistor of 6.2 Ω change if the voltage increased by a factor of 3?

• The current would decrease

• The resistance would triple

• The current would increase by a factor of 3

• The electrons would slow down

Which statement describes the movement of current and electrons in a wire?

• Current and electrons move in the same direction

• Electric current runs from the positive to a negative terminal, and electrons move in the opposite direction

• Current flows from negative to positive, electrons remain stationary

• Electrons move randomly, current does not move

One ampere of current is defined by the movement of which of these through a given area in one second?

• One volt

• One coulomb of charge

• One ohm

• One newton