Voltage - Wikipedia
Electric forces hold together the atoms and molecules in your eyes which allow you to read this Electric potential energy, electric potential, and voltage. hello friend force is a quantity that causes acceleration in a body. Hence by defination of force there are many types. -mechanical forces -magnetic force. Voltage, electric potential difference, electric pressure or electric tension is the difference in A voltage may represent either a source of energy (electromotive force) or lost, used, or stored energy (potential drop). .. In relation to "flow", the larger the "pressure difference" between two points (potential difference or water .
The hydraulic analogy is a useful way of understanding many electrical concepts. In such a system, the work done to move water is equal to the pressure multiplied by the volume of water moved.
Similarly, in an electrical circuit, the work done to move electrons or other charge-carriers is equal to "electrical pressure" multiplied by the quantity of electrical charges moved. In relation to "flow", the larger the "pressure difference" between two points potential difference or water pressure differencethe greater the flow between them electric current or water flow.
See " electric power ". Working on high voltage power lines Specifying a voltage measurement requires explicit or implicit specification of the points across which the voltage is measured. When using a voltmeter to measure potential difference, one electrical lead of the voltmeter must be connected to the first point, one to the second point.
Electric potential, voltage
A common use of the term "voltage" is in describing the voltage dropped across an electrical device such as a resistor. The voltage drop across the device can be understood as the difference between measurements at each terminal of the device with respect to a common reference point or ground.
The voltage drop is the difference between the two readings. Two points in an electric circuit that are connected by an ideal conductor without resistance and not within a changing magnetic field have a voltage of zero. Any two points with the same potential may be connected by a conductor and no current will flow between them.
The various voltages in a circuit can be computed using Kirchhoff's circuit laws. When talking about alternating current AC there is a difference between instantaneous voltage and average voltage.
- Electric charge, field, and potential
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Instantaneous voltages can be added for direct current DC and AC, but average voltages can be meaningfully added only when they apply to signals that all have the same frequency and phase. Measuring instruments[ edit ] Multimeter set to measure voltage Instruments for measuring voltages include the voltmeterthe potentiometerand the oscilloscope.
The voltmeter works by measuring the current through a fixed resistor, which, according to Ohm's Lawis proportional to the voltage across the resistor. The force that we think of when we try to lift that parallel push-pull boat anchor is the mass times the acceleration of gravity, which happens to be 9.
When we multiply the number of kilograms by 9. Problem The output transformer for your watt push-pull amp weighs 6.
Work, Voltage, and Power
When holding it in your hands, what is the force of gravity pulling it downward? The force of gravity in newtons is then 3kg 9.
The top of your bench is 1. How much work is required to pick up the transformer and place it on the bench? What if the transformer is sitting on the floor in the next room, which is 20 meters away? Solution We determined in the previous problem that the force of gravity on a 6. The amount of work in joules is then 29N 1. It therefore takes the same amount of work, 35 joules. Voltage Opposite charges attract. If we move a negative electron towards another electron we perform work because we are moving against an opposing force.
Moving two electrons toward two other electrons requires more work because there is more opposing force. We often need a convenient way to describe how much work is required to move charge from one point to another. That concept is voltage. If moving a positive charge from point B to point A requires positive work, then point A is said to have a positive voltage with respect to B. The relationship between the work required in joules, the amount of charge in coulombs, and the voltage in volts is: Since W and Q can be positive or negative, it stands to reason that V can be positive or negative also.
Problem It takes 1. Notice that this is opposite to the actual electron flow. What is the voltage V across the resistor? Solution 1x electrons represent 1x We therefore conclude that the voltage at A is positive with respect to B by an amount equal to Thus there is a drop of volts across the resistor from the plate supply to the plate.
Power Power is a measure of the amount of work or energy being expended over time.Physics 12.4.3a - Voltage Electric Fields and Distance
When measured over the period of one second, the number of joules of sonic energy created from an Ampeg SVT with six push-pull power tubes cranked full blast is going to be far more than from a Champ 5E1. By the same concept it takes no additional work to physically lift your Hiwatt quickly, but it takes more power because the work is performed over a shorter time period.