DC Electricity part 1

Which of the following is NOT a source of Direct Current (DC)?

• Photovoltaic Cells
• Alternating Current (AC) Generators
• Batteries

What is the function of a commutator in a DC generator?

• To convert chemical energy to electrical energy
• To store electrical energy
• To convert AC to DC

What are the two electrodes in an electrochemical cell called?

• Cathode and Anode
• Positive and Negative Terminals
• Conductor and Insulator

What happens during the discharge of a primary cell?

• The chemical reaction can be reversed
• The anode becomes the cathode
• The chemical activity occurs only once

Why is a separator used in a zinc-carbon cell?

• To increase the cell's voltage
• To keep the anode and cathode materials from direct contact
• To serve as the cell's outer casing

What distinguishes a secondary cell from a primary cell?

• Secondary cells are used only once
• Secondary cells can be recharged
• Secondary cells cannot store energy

During discharge, what does a secondary cell convert its stored chemical energy into?

• Light energy
• Mechanical energy
• Electrical energy

What is the primary advantage of a Lithium-Ion cell?

• It cannot be recharged
• It has a high energy density and can be recharged
• It is cheaper than all other cells

What is the main material used in the positive plate of a lead-acid cell?

• Sponge lead (Pb)
• Lead dioxide (PbO2)
• Sulfuric acid (H2SO4)

What serves as the electrolyte in a lead-acid cell?

• Water (H2O)
• Nitric acid (HNO3)
• Sulfuric acid (H2SO4)