PDF Notes: 06_PHYSICS-IX(E)_PART_II

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    What are the electric charges that objects acquire when rubbed against each other?

    Objects become positively or negatively charged due to electron transfer.

    What is the charge of electrons?

    Electrons carry a negative charge.

    What is the unit of electric charge?

    The unit of electric charge is the coulomb (C).

    What happens to the electric charge in the capacitor when it is connected to an LED?

    The capacitor discharges, providing a momentary current.

    Why does the LED not glow continuously when connected to a charged capacitor?

    The charge in the capacitor depletes quickly, causing a brief glow.

    What is the difference in current flow between a capacitor and a button cell?

    A capacitor provides a momentary flow, while a button cell provides a continuous flow.

    What is the potential difference in a circuit?

    It is the work done to move a unit charge between two points.

    What is electro motive force (emf)?

    Emf is the potential difference when no current is drawn from a cell.

    How is potential difference measured?

    Using a voltmeter connected across the terminals of a cell.

    What happens when cells are connected in series?

    The total emf equals the sum of the individual cell emfs.

    What is the maximum potential difference obtained with four 1.5 V cells in series?

    The maximum potential difference is 6 V.

    What is the intensity of electric current?

    It is the quantity of electric charge flowing per unit time.

    How do you calculate electric current in a circuit?

    Current is calculated as charge divided by time (I = Q/t).

    What is the unit of electric current?

    The unit is the ampere (A), equivalent to C/s.

    What are primary cells?

    Cells that cannot be reused after discharge, like dry cells.

    What are secondary cells?

    Rechargeable cells that can be reused, like mobile batteries.