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Magnetic field-магнитное поле.
Voltage is electric potential energy per unit charge, measured in joules per coulomb ( = volts). It is often referred to as "electric potential", which then must be distinguished from electric potential energy by noting that the "potential" is a "per-unit-charge" quantity. Like mechanical potential energy, the zero of potential can be chosen at any point, so the difference in voltage is the quantity which is physically meaningful. The difference in voltage measured when moving from point A to point B is equal to the work which would have to be done, per unit charge, against the electric field to move the charge from A to B.
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| Used to calculate current in Ohm’s law. | Used to express conservation of energy around a circuit in the voltage law. | Used to calculate the potential from a distribution of charges. | Is generated by moving a wire in a magnetic field. |
Exercises
Give Russian equivalents of the following phrases.
An electric potential energy, the zero of potential the zero of potential, the difference in voltage, equal to the work, against the electric field, used to calculate current in Ohm’s law, around a circuit in the voltage law, in a magnetic field.
2.Complete the sentences.
1.Like mechanical potential energy, the zero of potential can be….2. The difference in voltage measured when moving… .3. Voltage is electric potential energy per unit charge, measured in….
Give the definitions.
Joules, Voltage.
Put questions to the following sentences
1. Voltage is electric potential energy per unit charge, measured in joules per coulomb ( = volts).2.The zero of potential can be chosen at any point.3. the difference in voltage is the quantity which is physically meaningful.
Text 4
Electromotive Force (EMF)
Vocabulary
Battery –батарея