Electric Current and Conductivity Quiz

What is required for electric current to flow through a conductor?

Which of the following is considered a good conductor of electricity?

What happens when a material with good conductivity is tested using a conduction tester?

Which of the following can be used to test the conductivity of materials if weak current is suspected?

How can a magnetic compass be utilized in testing conductivity?

Which of the following liquids is a poor conductor of electricity?

What defines electrical conductivity in a material?

Which of these materials is classified as a poor conductor?

What are the two types of electrodes in electrolysis?

Which term refers to ions that move towards the cathode during electrolysis?

What occurs at the anode during the electrolysis of water?

What is the primary purpose of electroplating?

Which of the following compounds can act as an electrolyte?

What type of current is required for electrolysis to occur?

During electrolysis, what is the process called when particles become electrically charged?

What is produced at the cathode during the electrolysis of water?

Electric Current

Defined as the flow of electrons
Cannot flow on its own, needs a closed-loop path (circuit)
Circuit components include wire, battery, switch, and bulb
Produces chemical, heating, and magnetic effects

Electrical Conductivity

Ability of a material to conduct electricity
Materials classified as conductors, semiconductors, and poor conductors
Solids: Some are good conductors (e.g., copper, steel, iron, aluminum)
Solids: Some are poor conductors (e.g., wood, plastic, rubber, glass)
Liquids: Some are good conductors (e.g., tap water, salt solutions, acids, bases, salts)
Liquids: Some are poor conductors (e.g., distilled water, sugar solutions, kerosene, spirit)

Conduction Tester

Device to determine if a substance is a good or poor conductor
Method 1 (torch bulb):
- Connects cell and bulb by wires
- Other wires contact the material to test
- Good conductor: bulb glows
- Poor conductor: bulb does not glow
Method 2 (LED):
- LED glows even with a weak current
Method 3 (magnetic compass):
- Compass needle deflects with current flow (even weak current)

Electrolysis

Electrodes: metal plates through which current flows
- Cathode: connected to the negative terminal (negatively charged)
- Anode: connected to the positive terminal (positively charged)
Electrolyte: aqueous solution that conducts electricity while undergoing a chemical change (e.g., copper sulphate, tap water)
Ions: charged particles formed when an electrolyte is in a solution. Cations are positively charged and move towards the cathode, anions are negatively charged and move towards the anode.
Electrolysis of water splits water into hydrogen and oxygen gases.

Electroplating

Process of depositing a layer of metal onto another material via electricity
Example: Coating copper on an object, using copper sulphate solution
Applications:
- Protecting metals from corrosion
- Enhancing appearance (shininess)
- Using cost-effective coatings for expensive metals (e.g., chromium on cheaper metal)
- Various industrial and consumer applications

Test your knowledge on electric current, electrical conductivity, and conduction testing methods. This quiz covers the definitions, properties, and classifications of materials as conductors or insulators. Challenge yourself with practical scenarios related to electric circuits and conductivity.