Science Final Review

What are the laws of Electric Charge?

• Like charges attract, opposite charges repel
• Opposite charges repel.

  Like charges attract.

  Charged objects repel neutral objects.

• 1. Opposite charges attract.

  2. Like charges attract.

  3. Charged objects repel neutral objects.

• 1. Opposite charges attract.

  2. Like charges repel.

  3. Charged objects attract neutral objects.

What are the essential components that make up an electric circuit?

• Power source, switch, transformer, fuse
• Battery, resistor, conductor

• Generator, wire, relay, sensor
• Source, conductor, electric load, switch

How does static electricity differ from current electricity, and what causes static charge?

• • Static electricity involves the build-up of an electric charge on an object and its eventual release. 

  • This charge arises from the transfer of electrons between objects, often through friction. 

• Current electricity is caused by friction between surfaces.
• Static charge is caused by magnetic fields.
• Static electricity is the flow of charge; current electricity is the buildup of charge.

Laws of Electric Charge: 1. Opposite charges _________. 2. Like charges _________. 3. Charged objects attract _________ objects. Fill in the blanks.

• neutral, neutral, neutral
• 1. attract, 2. repel, 3. neutral
• repel, attract, negative
• attract, repel, positive

Which of the following lists the essential components that make up an electric circuit?

• • Switch, fuse, relay, antenna

• Power source, switch, resistor
• Power source, conductive path, load
• Battery, magnet, bulb, wire

Static electricity differs from current electricity because static charge is caused by the accumulation of electric charges on the surface of an object, while current electricity involves the flow of electric charges through a conductor.

• Static electricity is the flow of electric charges.
• Static electricity is caused by the accumulation of charges, while current electricity involves the flow of charges.

• Current electricity is caused by charge accumulation.
• Static electricity can only occur in conductors.

Electric potential difference, or voltage, is the amount of potential energy stored that motivates electrons to move within a circuit. It is measured in _________.

• amperes (A)

• ohms(Ω)

• volts (V)

• watts(W)

Which of the following is analogous to voltage in the analogy of water flow?

• The pressure exerted by a pump lifting water to a higher level

• water temperature
• pipe diameter
• water flow rate

Which of the following factors does NOT affect a conductor's resistance?

• The material of the conductor
• The temperature of the conductor
• The color of the conductor
• The length of the conductor

Energy efficiency in the context of electrical devices refers to how effectively a device uses electricity to perform its function, and it is important in household electricity use because it helps reduce energy consumption and lower electricity bills. Which of the following best describes energy efficiency in electrical devices and its importance in household electricity use?

• It is the total amount of electricity a device can consume in a day.

• It is how effectively a device uses electricity, helping to reduce energy consumption and lower bills.

• It is the ability of a device to work faster regardless of energy use.

• Energy efficiency is the total amount of electricity a device can consume.