Podcast
Questions and Answers
What defines a closed loop in an electrical circuit?
What defines a closed loop in an electrical circuit?
- The wires are connected to a single battery.
- Current flows only if there's an insulator present.
- A switch that controls the circuit wants to be closed.
- All components including batteries, bulbs, and wires are connected. (correct)
What happens to the light bulbs in an open loop?
What happens to the light bulbs in an open loop?
- The bulbs glow dimly.
- The bulbs do not light. (correct)
- The bulbs light up brightly.
- The bulbs flicker on and off.
What is the conventional direction of current flow?
What is the conventional direction of current flow?
- From the positive terminal to the negative terminal. (correct)
- From the negative terminal to the positive terminal.
- In a random direction, depending on the components.
- It varies based on the type of circuit.
Which statement accurately describes the difference between electron flow and conventional current?
Which statement accurately describes the difference between electron flow and conventional current?
What is the unit of measurement for electrical current?
What is the unit of measurement for electrical current?
Which of the following best describes conductors?
Which of the following best describes conductors?
What role does a compass play in an electrical circuit?
What role does a compass play in an electrical circuit?
Which of these materials acts as an insulator?
Which of these materials acts as an insulator?
Flashcards
Closed Loop
Closed Loop
A complete and unbroken path for electricity to flow through, including the battery, wires, and light bulbs.
Open Loop
Open Loop
A break or gap in the circuit, preventing electricity from flowing and making the light bulbs turn off.
Compass
Compass
A device that shows the direction of electric current flow by pointing towards the magnetic field.
Current
Current
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Conductor
Conductor
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Insulator
Insulator
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Conventional Current
Conventional Current
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Electron Flow
Electron Flow
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Study Notes
Castle Electricity - Section 1
- Closed loop: All batteries, bulbs, and wires are connected. The light bulbs light.
- Open loop: A break in the wires causes the bulbs to not light.
- Compass: Measures current and magnetic fields in wires. The amount of deflection in a compass is the same throughout a wire and reverses if the leads are reversed.
- Circuit: A closed loop of electrical components creating a continuous path. A battery causes something (though unseen) to move through the wires.
- Conventional current: Charges leave the positive (+) end of the battery, travel through the wire(s) and re-enter at the negative (-) end, following this established direction. This is the historically used and widely accepted convention.
- Electron flow: Electrons actually move from the negative (-) end of the battery to the positive (+) end. This is the actual movement of charge.
Electricity Concepts
- Electron flow: Electrons flow from the negative (-) terminal to the positive (+) terminal of a voltage source.
- Conventional current: Current flows from the positive (+) terminal to the negative (-) terminal.
- Current: The number of electrons passing through a conductor per second, measured in amperes (amps).
- Conductor: A material that allows electric current to flow easily (metals, except graphite).
Light Bulbs
- Flow: The electric current flows in a light bulb from one end (threaded or tip) and flows to the filament, then back to the other end.
- Gas: The gas inside (usually argon) allows the filament to light up.
- Filament: The filament's atoms absorb energy from the electricity and jump to higher energy levels. Their return to lower energy levels emits light.
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