Charging

What is the unit of electric charge?

• Ampere (A)

• Volt (V)

• Coulomb (C)

• Ohm (Ω)

What is the significance of a metal doorknob in discharging static electricity?

• A metal doorknob provides a conductive path to the ground, allowing static charge to dissipate.

• A metal doorknob prevents static electricity from building up.

• A metal doorknob acts as an insulator to protect against electric shocks.

• A metal doorknob increases the static charge in the surrounding area.

What happens to a plastic strip when it is rubbed with cotton?

• The plastic strip gains electrons from the cotton and becomes negatively charged.

• The plastic strip loses electrons to the cotton and becomes positively charged.

• The plastic strip remains neutral and does not change its charge.

• The plastic strip becomes a conductor and allows electricity to flow.

What is the difference between charging by friction and charging by induction?

• Charging by friction involves direct contact and transfer of electrons, while charging by induction involves rearranging charges without direct contact.

• Charging by friction involves rearranging charges without direct contact, while charging by induction involves direct contact and transfer of electrons.

• Charging by friction and induction are the same process of transferring electrons.

• Charging by friction requires a vacuum, while charging by induction can occur in any environment.

What is the principle of conservation of charge?

• The total electric charge in an isolated system remains constant.

• Electric charge can be created and destroyed in an isolated system.

• The total electric charge in a closed system can change over time.

• Electric charge is always positive and cannot be negative.

What is a conductor?

• A material that resists the flow of electrons.

• A material through which electrons move easily.

• A substance that does not allow electricity to pass through.

• A type of insulator used in electrical circuits.

What is the difference between positive and negative charges?

• Positive charges are created by an excess of electrons, while negative charges are created by a deficit of electrons.

• Positive charges are created by a deficit of electrons, while negative charges are created by an excess of electrons.

• Positive charges are neutral, while negative charges are always moving.

• Positive charges attract other positive charges, while negative charges repel other negative charges.

What is static electricity?

• A type of electric current that flows continuously

• A stationary electric charge typically produced by friction.

• An electric charge that moves rapidly through a conductor

• A phenomenon caused by the interaction of magnetic fields.

What is the role of electrons in charging?

• Electrons are positively charged particles that can be transferred between materials.

• Electrons are neutral particles that do not play a role in charging.

• Electrons are negatively charged particles that can be transferred between materials.

• Electrons are particles that only exist in metals and cannot be transferred.

What is the purpose of a lightning rod?

• To attract lightning and store it for later use.

• To safely direct lightning strikes to the ground, preventing damage.

• To create a visual display during thunderstorms.

• To prevent rain from falling on buildings.