Principles of Electricity

What is the definition of an 'atom' and its constituent particles?

• The smallest unit of a chemical element, consisting of protons, neutrons, and electrons.

• A large molecule made up of smaller molecules.

• A type of chemical bond between atoms.

• A form of energy that can be stored in chemical bonds.

How does atomic size relate to conductivity?

• Larger atomic size generally increases conductivity.

• Smaller atomic size generally increases conductivity.

• Atomic size has no effect on conductivity.

• Atomic size only affects thermal conductivity.

Why is copper a preferred material in the electrical industry?

• It is the cheapest metal available.

• It has high electrical conductivity and is durable.

• It is the lightest metal.

• It is resistant to corrosion.

What is the difference between electron flow and conventional current?

• Electron flow is in the same direction as conventional current.

• Electron flow is opposite to the direction of conventional current.

• Electron flow is faster than conventional current.

• Electron flow is slower than conventional current.

Define 'conductor' and 'insulator' and provide examples.

• A conductor allows electricity to flow easily; an insulator does not. Examples: copper (conductor), rubber (insulator).

• A conductor does not allow electricity to flow; an insulator does. Examples: rubber (conductor), copper (insulator).

• Both conductors and insulators allow electricity to flow easily. Examples: copper and rubber.

• Neither conductors nor insulators allow electricity to flow. Examples: wood and plastic.

Identify the three primary effects of an electric current.

• Thermal, chemical, and magnetic effects.

• Thermal, optical, and gravitational effects.

• Chemical, optical, and gravitational effects.

• Magnetic, optical, and thermal effects.

Explain how each of the effects manifests in the flow of electricity.

• Thermal effect causes heating, chemical effect causes chemical reactions, magnetic effect creates magnetic fields.

• Thermal effect creates magnetic fields, chemical effect causes heating, magnetic effect causes chemical reactions.

• Thermal effect causes chemical reactions, chemical effect creates magnetic fields, magnetic effect causes heating.

• Thermal effect creates light, chemical effect causes sound, magnetic effect creates heat.

What are the tiny particles that make up matter called?

• Atoms

• Molecules

• Cells

• Compounds

What are molecules made up of?

• Cells

• Electrons

• Atoms

• Protons

What is the charge of protons found in the nucleus of an atom?

• Positively charged

• Negatively charged

• Neutrally charged

• No charge