Physics Chapter 7 Review Flashcards
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Questions and Answers

Resistance is measured in a unit called the ____.

Ohm

What is the correct relationship among power, current, and voltage?

P = I x V

What is a parallel circuit?

A circuit that has two or more separate branches for current.

What is an insulator?

<p>A material through which electrons do not move easily.</p> Signup and view all the answers

What is Ohm's Law?

<p>Current is equal to the voltage difference divided by the resistance.</p> Signup and view all the answers

What is one source of constant electric current?

<p>Dry Cell</p> Signup and view all the answers

A static discharge differs from an electric current in that a static discharge ____.

<p>lasts for only a fraction of a second</p> Signup and view all the answers

What is a series circuit?

<p>A path that allows only one route for a current.</p> Signup and view all the answers

What is static electricity?

<p>Electric charge that has accumulated on an object.</p> Signup and view all the answers

What is electrical power?

<p>The rate at which an electrical device converts energy from one form to another.</p> Signup and view all the answers

Lightning is ____.

<p>a very large discharge of static electricity.</p> Signup and view all the answers

What is the purpose of a circuit breaker?

<p>A device designed to open an overloaded circuit and prevent overheating.</p> Signup and view all the answers

The voltage ____ as current moves through a circuit.

<p>varies</p> Signup and view all the answers

What is a wet cell?

<p>Car battery</p> Signup and view all the answers

What is a conductor?

<p>A material that allows electrons to move through it easily.</p> Signup and view all the answers

What is voltage difference?

<p>The push that causes charges to move.</p> Signup and view all the answers

What surrounds electric charge and exerts force on other charges?

<p>Electric field</p> Signup and view all the answers

What is another term for a parallel circuit?

<p>Circuit with more than one path.</p> Signup and view all the answers

What is electric power?

<p>Rate at which electrical energy is changed to another energy form.</p> Signup and view all the answers

What is resistance?

<p>Tendency of a material to oppose electron flow.</p> Signup and view all the answers

What is a kilowatt hour?

<p>Unit of electrical energy.</p> Signup and view all the answers

What directs lightning to Earth?

<p>Lightning rod</p> Signup and view all the answers

What is a circuit?

<p>Closed path through which electrons flow.</p> Signup and view all the answers

What is an electric current?

<p>A flow of electrons through a conductor.</p> Signup and view all the answers

What is static electricity?

<p>Accumulation of electric charges on an object.</p> Signup and view all the answers

What is an insulator?

<p>Does not allow electricity to flow through it easily.</p> Signup and view all the answers

What is a dry cell?

<p>Flashlight.</p> Signup and view all the answers

What is a series circuit?

<p>Circuit with only one path.</p> Signup and view all the answers

What is Ohm's Law?

<p>Current is equal to the voltage difference of a circuit divided by its resistance.</p> Signup and view all the answers

Study Notes

Electrical Concepts

  • Ohm is the unit of resistance in electrical circuits.
  • Power (P) is calculated with the formula P = I x V, linking power, current (I), and voltage (V).
  • A parallel circuit consists of multiple branches for current flow, allowing various pathways.
  • Insulators are materials that impede the flow of electrons.
  • Ohm's Law defines the relationship between current, voltage difference, and resistance: current = voltage difference / resistance.
  • A dry cell is a source of constant electric current, commonly used in batteries.
  • Static discharge occurs rapidly, lasting only a fraction of a second, distinct from continuous electric current.
  • A series circuit permits current to flow through a single pathway only.
  • Static electricity refers to an accumulation of electric charge on an object.
  • Electrical power is the rate at which an electrical device converts energy from one form to another.

Electrical Phenomena

  • Lightning represents a significant and rapid discharge of static electricity.
  • Circuit breakers are safety devices designed to interrupt overloaded circuits, preventing overheating.
  • As current traverses a circuit, the voltage varies due to resistance in different parts of the circuit.

Battery Types

  • A wet cell refers to a type of battery, such as those used in vehicles.
  • A dry cell is often used in portable devices like flashlights.

Conductors and Insulators

  • Conductors allow electrons to flow easily, while insulators restrict this movement.
  • The voltage difference acts as a push that motivates charges to move within a circuit.

Electromagnetic Concepts

  • An electric field surrounds electric charges and applies force on other nearby charges.
  • The unit of electrical energy is the kilowatt hour, commonly used in measuring electricity consumption.

Safety Devices

  • Lightning rods are metal structures designed to redirect lightning strikes safely to the ground.
  • A circuit is defined as a closed path allowing electrons to flow uninterrupted, essential for circuit functionality.

Current and Charge

  • Electric current denotes the flow of electrons through a conductor, and static electricity is the presence of accumulated electric charges on surfaces.

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Description

Test your knowledge of key concepts from Chapter 7 of Physics. This quiz covers essential terms such as Ohm, Ohm's Law, and the principles of circuits. Perfect for reviewing and reinforcing your understanding of electrical resistance and circuit design.

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