Understanding Electron Volts and Joules

The video tutorial explains the concept of electron volts as a unit of energy related to electrons. It covers the conversion between electron volts and joules, illustrating how an electron gains kinetic energy while losing potential energy when moving through an electric field. The tutorial also demonstrates how to calculate energy changes in systems with multiple electrons and discusses the distribution of voltage among electrons. Key concepts include the conservation of mechanical energy and the relationship between charge, voltage, and energy.

What is an electron volt primarily used to measure?

• Time

• Distance

• Mass

• Energy

When an electron moves from a negatively charged plate to a positively charged plate, what happens to its kinetic energy?

• It decreases

• It remains the same

• It becomes zero

• It increases

How many joules are equivalent to one electron volt?

• 1.6 x 10^9 joules

• 1.6 x 10^-9 joules

• 1.6 x 10^19 joules

• 1.6 x 10^-19 joules

If you have 250 electron volts, how many joules is this equivalent to?

• 4 x 10^-18 joules

• 4 x 10^-15 joules

• 4 x 10^-17 joules

• 4 x 10^-19 joules

What happens to the voltage on each electron as the number of electrons increases while maintaining the same total energy?

• It becomes zero

• It remains constant

• It decreases

• It increases

If 40 electrons each have a voltage of 50 volts, what is the total energy in electron volts?

• 2000 electron volts

• 1000 electron volts

• 500 electron volts

• 2500 electron volts

How many electrons are present if the total energy is 5000 electron volts and each electron has a voltage of 20 volts?

• 150 electrons

• 300 electrons

• 200 electrons

• 250 electrons

What is the potential energy change in electron volts if 80 electrons travel through a potential difference of 500 volts?

• -50,000 electron volts

• 40,000 electron volts

• -40,000 electron volts

• 50,000 electron volts

If the potential energy decreases by 40,000 electron volts, what happens to the kinetic energy?

• It increases by 40,000 electron volts

• It decreases by 40,000 electron volts

• It remains the same

• It becomes zero

What formula can be used to calculate the energy in electron volts if you have the number of electrons and the voltage?

• Energy = Voltage / Number of electrons

• Energy = Charge / Voltage

• Energy = Number of electrons x Voltage

• Energy = Voltage x Charge