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Questions and Answers
What condition must be met for the light bulbs to light up in a closed loop circuit?
What condition must be met for the light bulbs to light up in a closed loop circuit?
- A break in any of the wires
- All components must be connected properly (correct)
- Only positive charges should be flowing
- The battery must be reversed
Which statement correctly describes the compass's role in the circuit?
Which statement correctly describes the compass's role in the circuit?
- It prevents short circuits.
- It indicates the activity in the wires. (correct)
- It helps to measure current directly.
- It powers the circuit.
What is the conventional direction of current flow in a circuit?
What is the conventional direction of current flow in a circuit?
- From the ground to the battery
- From the negative terminal to the positive terminal
- From the battery to the bulbs
- From the positive terminal to the negative terminal (correct)
Which of the following materials is considered an insulator?
Which of the following materials is considered an insulator?
What does the term 'current' refer to in an electrical circuit?
What does the term 'current' refer to in an electrical circuit?
Which of the following statements about electron flow is true?
Which of the following statements about electron flow is true?
What types of materials are typically classified as conductors?
What types of materials are typically classified as conductors?
Which statement reflects an important aspect of conventional current?
Which statement reflects an important aspect of conventional current?
Flashcards
Closed Loop
Closed Loop
A closed loop in an electrical circuit means all components, like batteries, bulbs, and wires, are connected without breaks, allowing electricity to flow and light bulbs to turn on.
Open Loop
Open Loop
An open loop in an electrical circuit means there's a break or gap in the path, preventing the flow of electricity and causing bulbs to remain off.
Compass in Circuits
Compass in Circuits
A compass is used to detect the presence and direction of electrical current in a wire. The needle of a compass deflects when placed near a wire carrying current.
Electrical Circuit
Electrical Circuit
An unbroken path that allows electrical current to flow continuously through components like batteries, bulbs, and wires.
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Conductor
Conductor
Materials like metals that allow electricity to flow easily through them, enabling components like light bulbs to light up.
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Insulator
Insulator
Materials like nonmetals that resist the flow of electricity, preventing components from functioning. They act as barriers.
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Current
Current
The flow of electrical charges through a conductor. Measured in amperes (amps).
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Conventional Current vs Electron Flow
Conventional Current vs Electron Flow
The direction of the conventional current is from the positive terminal of a battery to the negative terminal. However, the actual flow of electrons is from negative to positive.
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Castle Electricity - Section 1
- Closed loop: A complete circuit where the batteries, bulbs, and wires are connected, causing the bulbs to light.
- Open loop: A broken circuit, where a break in the wires prevents the bulbs from lighting.
- Compass: Used to detect current and magnetic fields in wires. Deflection amount and direction are consistent with current and direction of the wire's current.
- Circuit: A continuous path for electrical current (unbroken loop) through components. Current means something is moving though the wire, but it cannot be viewed directly; a compass is used instead.
- Conventional current: The direction is from the positive (+) end of the battery to the negative (-) end. This is the direction of positive charge flow (though it's actually electrons flowing). This is the model used initially by Ben Franklin.
- Electron flow: Electrons flow in the opposite direction - from the negative (-) end of the battery to the positive (+) end.
Electricity - Further Concepts
- Electron flow: Electrons move from the negative terminal of a voltage source to the positive terminal.
- Conventional current: Current flows from the positive to the negative terminal. This is conventionally considered as positive charges.
- Current: The rate at which electric charge flows past a point. Measured in amperes (amps).
- Conductor: Materials allowing electric current to flow (e.g., metals).
- Insulator: Materials resisting the flow of current (e.g., non-metals).
- Light Bulbs: A flow of electrons comes in from the threaded section or from the tip of the bulb and moves through its filament. This passes through the gas (usually argon) in the bulb and causes the filament to vibrate and excite the atoms, making them light up. The electrons jump levels and back down.
Diagram of a Light Bulb
- Glass Bulb: Encloses the filament and gas.
- Inert Gas/Vacuum: Surrounds the filament.
- Metal Filament: Thin wire that glows when current passes through it.
- Base/Cap: The bottom part of the bulb.
- Glass Support: Supports the filament.
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