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Questions and Answers
What is the SI unit of electric current?
What is the SI unit of electric current?
What happens to the resistance in a conductor when its temperature increases?
What happens to the resistance in a conductor when its temperature increases?
In which type of circuit does the current have only one path to flow through?
In which type of circuit does the current have only one path to flow through?
What is the relationship between voltage, current, and resistance in an electrical circuit?
What is the relationship between voltage, current, and resistance in an electrical circuit?
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What is the process by which rocks are broken down into smaller pieces?
What is the process by which rocks are broken down into smaller pieces?
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What is the main agent of chemical weathering?
What is the main agent of chemical weathering?
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Which type of weathering involves the physical breakdown of rocks without changing their chemical composition?
Which type of weathering involves the physical breakdown of rocks without changing their chemical composition?
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What are the two main types of mechanical weathering?
What are the two main types of mechanical weathering?
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Study Notes
Electric Current and Resistance
- The SI unit of electric current is the Ampere (A).
- As the temperature of a conductor increases, its resistance generally increases due to greater lattice vibrations that impede electron flow.
- A series circuit is one where the current has only one path to flow through, meaning that all components are connected end-to-end.
Ohm's Law and Electrical Relationships
- The relationship between voltage (V), current (I), and resistance (R) in an electrical circuit is described by Ohm's Law: V = I × R, indicating that voltage is the product of current and resistance.
Weathering Processes
- The process by which rocks are broken down into smaller pieces is called weathering.
- The main agent of chemical weathering is water, which reacts with minerals in the rocks and alters their chemical composition.
- Physical weathering, also known as mechanical weathering, involves the breakdown of rocks into smaller pieces without changing their chemical composition.
Types of Weathering
- Two main types of mechanical weathering include freeze-thaw weathering, where water seeps into cracks, freezes, expands, and eventually breaks the rock apart, and abrasion, which is caused by rock particles being worn away by friction or impact.
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Description
Test your knowledge of electric current, resistance, circuits, and the relationship between voltage, current, and resistance in an electrical circuit with this class 9 quiz.
