Watts can also be used to measure the rate of power consumption. For example, a 100-watt light bulb produces 100 joules of energy per second. Watts measures the amount of work that can be done in a given time period. It is named after James Watt, who was the first to use this unit of measurement. To learn more about electricity and related topics, check out the links on the next page.Watts is a unit of measurement that indicates the rate of energy transfer.
VOLT VS WATT VSAMP GENERATOR
But some new models employ hybrid systems with a separate 48-volt generator to power advanced features like idle shut-off while increasing overall system efficiency. The switch never happened, because carmakers were able to boost efficiencies with digital technology and more efficient electric pumps at 12 volts. Switching to a higher-voltage system would provide more power with thinner-gauge wiring. As more cars shipped with electric-powered amenities - video displays, seat heaters, "smart" climate control - they required thick bundles of wiring to supply enough current. This improvement in efficiency is what drove the automobile industry to consider switching from 12-volt electrical systems to 42-volt systems in the 1990s. The efficiency of electric motors also improves at higher voltages. So, using a higher voltage to reduce the current can make electrical systems more efficient. But it increases dramatically if the current going through the wires increases. What this equation tells you is that the power consumed by the wires increases if the resistance of the wires increases (for instance, if the wires get smaller or are made of a less conductive material). P = V*I substituting for V we get P = I*R*I, or P = I 2*R Now you can substitute the equation for V into the other equation: What you need is an equation for power in terms of resistance and current. You can see how this happens by doing a little rearranging of the two equations. The resistance in electrical wires consumes power, and the power consumed increases as the current going through the wires increases. There is an advantage that comes from using less current to make the same amount of power. So, this latter system produces the same power, but with half the current. What would happen if you use a 12-volt battery and a 12-volt light bulb to get 100 watts of power? If you increase the flow rate, the waterwheel turns faster because of the weight of the extra water hitting it.
If you increase the pressure of the water coming out of the hose, it hits the waterwheel with a lot more force and the wheel turns faster, generating more power. You can increase the power generated by the waterwheel in two ways.
Take a hose and point it at a waterwheel like the ones that were used to turn grinding stones in watermills. In an electrical system power ( P) is equal to the voltage multiplied by the current. This is like decreasing the resistance in an electrical system, which increases the current flow.Įlectrical power is measured in watts. You probably guessed that this also makes more water come out of the hose. Let's say you increase the diameter of the hose and all of the fittings to the tank. The same is true of an electrical system: Increasing the voltage will make more current flow. What happens if you increase the pressure in the tank? You probably can guess that this makes more water come out of the hose. Let's say you have a tank of pressurized water connected to a hose that you are using to water the garden. Let's see how this relation applies to the plumbing system. It says that the current is equal to the voltage divided by the resistance or I = V/R. There is a basic equation in electrical engineering that states how the three terms relate. The voltage is equivalent to the water pressure, the current is equivalent to the flow rate, and the resistance is like the pipe size. A neat analogy to help understand these terms is a system of plumbing pipes.
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