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Physics - Voltage

Voltage

The term voltage [1]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.

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Links:

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[1] http://alison.com/#

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 :)

So voltage is energy/Coulomb

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.

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