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Voltage

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    Qayyum M.
    MY
    Qayyum M.

    Can someone clarify me on this, please? "A light globe that is causing a voltage drop of 20 volts may actually mean that a coulomb of charge with 240 joules of energy passes through the globe and exits with only 220 joules of energy." Thanks in advance :)

    Sheneil C.
    JM
    Sheneil C.

    So voltage is energy/Coulomb

    Manish C.
    IN
    Manish C.

    The term voltage refers to the amount of energy given to a coulomb of charge as it passes through a battery or supply, or the amount of energy that a coulomb of charge gives up as it passes through a load. The term voltage refers to an energy change, also called a potential difference; actual energy values are not important. For example, a nine volt battery gives each passing coulomb nine more joules of energy regardless of the energy that the coulomb of charge may already possess. A light globe that is causing a voltage drop of 20 volts may actually mean that a coulomb of charge with 240 joules of energy passes through the globe and exits with only 220 joules of energy. When measuring a voltage value, the voltmeter is essentially comparing energy values either side of a circuit component, hence a voltmeter is placed 'in parallel' in a circuit.

    Anudeep S.
    IN
    Anudeep S.

    I couldn't get the meaning of globe. Can someone help?

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