Current Electricity — Flashcards
Maharashtra Board · Class 9 · Science
24 flashcards for Current Electricity (Maharashtra Board Class 9 Science) to test yourself on key terms and facts.
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What is electric potential and how does it relate to the flow of electric charge?
Answer
Electric potential is like an 'electric level' at a point. Just like water flows from higher level to lower level, positive charges flow from higher potential to lower potential. Electrons (negative c…
Define potential difference and give its formula and unit.
Answer
Potential difference is the difference between the values of potentials at two points. It is the work done to carry a unit positive charge from one point to another. Formula: V = W/Q, where V = potent…
What are free electrons and why are they important in electrical conduction?
Answer
Free electrons are the outermost electrons in metallic conductors that are weakly bound to the nucleus. They can easily move from one part of a conductor to another, carrying negative charge with them…
Define electric current and state its formula and unit.
Answer
Electric current is the flow of electrons through a conductor. It is defined as the charge passing through a conductor in unit time. Formula: I = Q/t, where I = current, Q = charge, t = time. Unit: Am…
Why is the conventional direction of current opposite to the direction of electron flow?
Answer
Historically, current was defined before the discovery of electrons. Scientists assumed positive charges were moving. Even though we now know electrons (negative charges) actually move from negative t…
State Ohm's Law and write its mathematical expression.
Answer
Ohm's Law: If the physical state of a conductor remains constant, the current flowing through it is directly proportional to the potential difference between its ends. Mathematical expression: V = IR,…
What is electrical resistance and what causes it in a conductor?
Answer
Electrical resistance is the hindrance or opposition to the flow of electric current in a conductor. It is caused by collisions between moving electrons and atoms/ions in the conductor. When electrons…
Define one ohm resistance and state the unit of resistance.
Answer
One ohm resistance: If one ampere current flows through a conductor when one volt potential difference is applied between its ends, then the resistance is one ohm. Unit: Ohm (Ω). From Ohm's law: 1Ω = …
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