Physics

Question 1

What is static electricity?

Answer 1

Static electricity is the buildup of electric charges on the surface of an object due to an imbalance of electrons.

Question 2

What is electrical force?

Answer 2

Electrical force, also known as electrostatic force, is the force of attraction or repulsion between electrically charged objects.

Question 3

What is induced charge separation?

Answer 3

Induced charge separation refers to the redistribution of electric charges in an object when it is brought near a charged object. This occurs without direct contact and results in an attraction or repulsion of charges.

Question 4

What is the law of electric charges?

Answer 4

1. Opposite charges, attract each other
2. Similar charges repel each other
3. Greater distance & smaller charges, weaker force
4. Smaller distance & greater charges, stronger force

Question 5

What is an electroscope?

Answer 5

An electroscope is a device used to detect and measure the presence of electric charges. It typically consists of a metal rod with a set of lightweight leaves, or a foil attached to the bottom.

Question 6

What is a pithball electroscope?

Answer 6

This is less sensitive to electric charges.

Question 7

What is a metal leaf electroscope?

Answer 7

This more sensitive to electrical charges.

Question 8

What is charging by friction?

Answer 8

Charging by friction is a method of charging objects where two materials are rubbed together, causing a transfer of electrons between them. One material gains electrons and becomes negatively charged, while the other loses electrons and becomes positively charged.

Question 9

What is charging by conduction?

Answer 9

Charging by conduction is a method of charging objects by bringing a charged object in contact with another object. Electrons transfer between the objects, resulting in both objects acquiring the same charge.

Question 10

What is grounding?

Answer 10

Is the adding or taking of electrons in an object.

Question 11

What are conductors?

Answer 11

Conductors are materials that allow electric charges to move freely through them. They have a high conductivity and typically contain loosely bound electrons that can easily move in response to an electric field. Examples of conductors include metals like copper and aluminum.

Question 12

What are insulators?

Answer 12

Insulators are materials that do not allow electric charges to move easily through them. They have a low conductivity and tightly bound electrons that are not free to move. Insulators are used to prevent the flow of electricity and include materials like rubber, plastic, and glass.

Question 13

What are semiconductors?

Answer 13

Semiconductors are materials that allow the flow of electrons to flow but not easily.

Question 14

What are superconductors?

Answer 14

Superconductors are materials that still conduct energy even though it’s cooled at a critical temperature.

Question 15

What is charging by induction?

Answer 15

Charging by induction is a method of charging objects by bringing a charged object near, but not in direct contact with, another object. This causes a redistribution of charges in the second object, resulting in one end becoming positively charged and the other end becoming negatively charged.

Question 16

What is electric discharge?

Answer 16

Rapid transfer of electrons

Question 17

What is lightning?

Answer 17

Lightning is a natural electrostatic discharge that occurs during thunderstorms. It is a powerful electrical discharge between the atmosphere and the ground or between different areas within a storm cloud. Lightning can be dangerous and can cause damage due to its high voltage and current.

Question 18

What is the difference between current electricity and static electricity?

Answer 18

The difference between current electricity and static electric is that current electricity has a flow of electrons that can be controlled, and they last for a while. For static electricity, this electricity cannot be controlled and only lasts for a short period of time.

Question 19

What is an electric circuit?

Answer 19

An electric circuit is a closed path through which electric charges can flow. It typically consists of a power source, conducting wires, and a load. Circuits allow the controlled movement of electric charges and enable the transfer of electrical energy.

Question 20

What is a load in an electric circuit?

Answer 20

A load in a circuit is what changes the electrical energy to another type of energy.

Question 21

What are conducting wires in an electric circuit?

Answer 21

Conducting wires are the pathways through which electric charges flow in an electric circuit.

Question 22

What is a switch in an electric circuit?

Answer 22

A switch is a device used to control the flow of electric current in a circuit.

Question 23

What is an energy source in an electric circuit?

Answer 23

An energy source in an electric circuit provides the electrical energy needed to power the circuit. It can be a battery or a generator.

Question 24

What is electrical energy?

Answer 24

Electrical energy refers to the energy carried by electric charges in an electric circuit. It is the form of energy that is used to power electrical devices and is typically measured in units of kilowatt-hours (kWh). Electrical energy is converted into other forms, such as light, heat, or mechanical energy, when consumed by loads in the circuit.

Question 25

What is an electrostatic paint sprayer?

Answer 25

An electrostatic paint sprayer is a device used to apply paint or coatings to surfaces using electrostatic forces. The sprayer charges the paint particles with static electricity, causing them to be attracted to the surface being painted, resulting in a more even and efficient application.

Question 26

What is an electrostatic duster?

Answer 26

An electrostatic duster is a cleaning tool designed to attract and capture dust particles using static electricity. The duster is typically made of a material that generates static charges, allowing it to effectively remove dust from surfaces without the need for cleaning solutions or chemicals.

Question 27

What are electrostatic precipitators?

Answer 27

Electrostatic precipitators are devices used to remove particulate matter, such as dust and smoke, from industrial exhaust gases. They use electrostatic forces to charge the particles, which are then attracted to oppositely charged plates or electrodes, allowing for their collection and removal from the gas stream.

Question 28

What is a laser printer?

Answer 28

A laser printer is a type of printer that uses a laser beam to produce high-quality text and images on paper. The laser beam creates electrostatic charges on a photosensitive drum, attracting toner particles that are transferred and fused onto the paper, resulting in the printed output.

Question 29

What is an electrostatic lifting apparatus (forensic)?

Answer 29

An electrostatic lifting apparatus is a forensic tool used to lift and collect latent fingerprints from various surfaces. It utilizes static electricity to attract and transfer the fingerprint residue onto a film or tape, which can then be examined and analyzed for identification purposes.

Question 30

What is an electrostatic speaker?

Answer 30

An electrostatic speaker is a type of audio speaker that operates based on the principles of electrostatics. It uses a thin, electrically charged diaphragm suspended between two stationary electrodes. When an audio signal is applied, the diaphragm vibrates, producing sound by displacing air molecules without the need for traditional drivers or cones.

Question 31

What is an electric cell?

Answer 31

An electric cell, also known as a battery, is a device that converts chemical energy into electrical energy. It consists of one or more electrochemical cells that produce a potential difference, allowing the flow of electric current.

Question 32

What is a primary cell?

Answer 32

A primary cell is a type of electric cell that is non-rechargeable and designed for single-use. Once the chemical reactions within the cell are exhausted, it cannot be recharged or reused.

Question 33

What is a secondary cell?

Answer 33

A secondary cell is a rechargeable electric cell that can be recharged and reused multiple times. It can reverse the chemical reactions within the cell using an external electrical source to restore its energy capacity.

Question 34

What is a hydrogen fuel cell?

Answer 34

A hydrogen fuel cell is an electrochemical cell that produces electricity through the reaction of hydrogen and oxygen. Hydrogen gas is supplied to the anode, oxygen or air to the cathode, and the resulting electrochemical reaction generates electricity, water, and heat. It is a clean and efficient energy conversion device.

Question 35

What are the advantages of a hydrogen fuel cell?

Answer 35

Some advantages of hydrogen fuel cells include high energy efficiency, low emissions (only producing water vapor), versatility in application (from vehicles to stationary power), and the potential to use hydrogen as a renewable energy source.

Question 36

What are the disadvantages of a hydrogen fuel cell?

Answer 36

Some disadvantages of hydrogen fuel cells include high production and infrastructure costs, the need for hydrogen storage and distribution systems, limited availability of hydrogen fueling stations, and the reliance on hydrogen production methods (which may involve fossil fuels).

Question 37

What is direct current (DC)?

Answer 37

Direct current (DC) is the flow of electric charge in one direction. The current maintains a constant polarity, and its magnitude does not change over time. DC is commonly used in batteries, electronic devices, and some power systems.

Question 38

What is alternating current (AC)?

Answer 38

Alternating current (AC) is the flow of electric charge that periodically reverses its direction. The current continuously changes its polarity and magnitude over time. AC is the type of electricity commonly used in homes, businesses, and the power grid.

Question 39

What is electricity?

Answer 39

Electricity is the flow of electric charge, typically carried by electrons, through a conductor. It is a form of energy that powers various devices and systems, including electrical appliances, lighting, and electronic circuits.

Question 40

What is the process of generating electricity?

Answer 40

Source/Supply—-Turns Turbine—Turns Coil in Magnetic Field—Generates Electrical Current

Question 41

Who was Michael Faraday?

Answer 41

Michael Faraday was a British scientist and physicist who lived from 1791 to 1867. He made significant contributions to the fields of electromagnetism and electrochemistry. Faraday is best known for his discoveries of electromagnetic induction, electrolysis, and the laws of electrolysis.

Question 42

What is a series circuit?

Answer 42

A series circuit is an electric circuit configuration where the components are connected one after another in a single path. In a series circuit, the same current flows through each component, and the total resistance is equal to the sum of the individual resistances.

Question 43

What is a parallel circuit?

Answer 43

A parallel circuit is an electric circuit configuration where the components are connected across multiple paths. In a parallel circuit, each component is connected directly to the power source, and the voltage across each component is the same. The total current is equal to the sum of the currents flowing through each component.

Question 44

What is a voltmeter?

Answer 44

A voltmeter is an electrical measuring instrument used to measure the voltage or potential difference between two points in an electric circuit. It is typically connected in parallel across the component or portion of the circuit for which the voltage is to be measured.

Question 45

What is an ammeter?

Answer 45

An ammeter is an electrical measuring instrument used to measure the electric current flowing through a circuit. It is connected in series with the component or portion of the circuit through which the current is to be measured. Ammeters are designed to have a low resistance to minimize their impact on the circuit.

Question 46

What is an ohmmeter?

Answer 46

An ohmmeter is an electrical measuring instrument used to measure the resistance of a component or portion of an electric circuit. It is connected across the component or circuit being measured and applies a known voltage or current to determine the resistance using Ohm’s law (R = V/I).