Power in Watts is calculated by multiplying voltage in Volts times current. The change in voltage is defined as the work done per unit charge, so it can be in general calculated from the electric field by calculating the work done against the electric field. Watts reflect work being done at a given moment, NOT the energy consumed over time. In the more general case where the electric field and angle can be changing, the expression must be generalized to a line integral: More detail on variable field If the distance moved, d, is not in the direction of the electric field, the work expression involves the scalar product: In the case of constant electric field when the movement is directly against the field, this can be written The change in voltage is defined as the work done per unit charge against the electric field. In an electrical circuit, electrical energy is calculated using the formula: Electrical energy voltage x current x time. HyperPhysics***** Electricity and Magnetism This association is the reminder of many often-used relationships: More general case The electric field is by definition the force per unit charge, so that multiplying the field times the plate separation gives the work per unit charge, which is by definition the change in voltage. It is the most commonly and frequently asked question by beginners even in job interviews for the basic trades. It is important to know the fundamentals of voltage and current for electrical and electronic engineering and all those related to the electricity. Work Done by Electric field Work and Voltage: Constant Electric Field The case of a constant electricfield, as between charged parallelplate conductors, is a good exampleof the relationship between workand voltage. Current and voltage are two different electrical antiquates but related to each other.
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