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?
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What is Ohm's Law?
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What is one source of constant electric current?
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A static discharge differs from an electric current in that a static discharge ____.
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What is a series circuit?
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What is static electricity?
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What is electrical power?
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Lightning is ____.
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What is the purpose of a circuit breaker?
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The voltage ____ as current moves through a circuit.
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What is a wet cell?
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What is a conductor?
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What is voltage difference?
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What surrounds electric charge and exerts force on other charges?
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What is another term for a parallel circuit?
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What is electric power?
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What is resistance?
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What is a kilowatt hour?
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What directs lightning to Earth?
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What is a circuit?
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What is an electric current?
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What is static electricity?
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What is an insulator?
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What is a dry cell?
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What is a series circuit?
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What is Ohm's Law?
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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.
