Electrochemical Cells and Current

This video tutorial explains the concept of electrochemical cells, focusing on how metals form ions and release electrons, which are measured in volts using a voltmeter. It describes setting up an electrochemical cell with copper and zinc, explaining the flow of electrons and how electric current is measured in amps. The video also discusses the impact of different metals' positions in the electrochemical series on voltage and current, using magnesium as an example. Finally, it summarizes the key learnings about the relationship between metal combinations and the resulting voltage and current.

What is the charge of an electron?

• Variable

• Neutral

• Positive

• Negative

What device is used to measure the force with which electrons are pushed?

• Ohmmeter

• Thermometer

• Voltmeter

• Ammeter

What is a battery technically defined as?

• A single electrochemical cell

• A collection of cells connected together

• A device that stores electrons

• A device that measures current

What happens when a strip of zinc and a strip of copper are connected in an electrochemical cell?

• Electrons flow from copper to zinc

• Electrons flow in both directions

• Electrons flow from zinc to copper

• No electron flow occurs

How is electric current measured?

• In watts

• In amps

• In ohms

• In volts

What moves across the salt bridge in an electrochemical cell?

• Neutrons

• Protons

• Electrons

• Charged ions

What is the main cause of electric current in an electrochemical cell?

• Movement of neutrons through the solution

• Movement of protons through the wire

• Movement of electrons through the wire

• Movement of electrons through the solution

What would happen if magnesium replaced zinc in the electrochemical cell?

• Higher voltage and current

• Voltage would increase, current would decrease

• No change in voltage and current

• Lower voltage and current

What determines the size of the voltage and current in an electrochemical cell?

• The temperature of the solution

• The size of the metals

• The color of the metals

• The position of the metals in the electrochemical series

What is the relationship between the position of metals in the electrochemical series and the voltage produced?

• Only the metal with higher position matters

• Position does not affect voltage

• Further apart metals produce higher voltage

• Closer metals produce higher voltage