How much electrical current does the brain use?
It has 5 watts.
Electrical current is measured in Amperes which is abbreviated to amps. When dealing with formulae the letter I is used to represent current, for example: Power = Voltage × Current = volts × amps = V × I Small currents in electrical engineering use the lower case i; this can cause confusion with the lower case i that mathematicians use for √-1, so they use j for √-1 instead.
What is the difference between objects that use electricity from power stations and those that use electricity from batteries?
Technically, you are speaking about the delivery of current. Electricity is one type of current. The current has two differences: The current from batteries has a much lower voltage, and it is DC, while the electricity from the electrical plug is AC. Devices that use current have to be adapted to these two situations. Some devices are only battery powered, e.g. flashlight. Other devices have internal mechanisms to switch the power current between battery and…
i think the answer is more on economical reasons ( 220v in the phil ).. since Voltage is inversely proportional to current..the higher the voltage, the lower the current..the lower the current, the smaller the electrical cable to use. In short, if we used 220v, electrical cable to be used is much smaller compared to the cable used in 110v..Smaller cable means less price than of the much larger cable.. :))
An electrical wire will heat up, depending on how much current passes through it. The amount of heat produced (and power wasted) is proportional to the square of the current. Usually, the main worry is that the circuit may overheat. Thus, it doesn't really matter how many machines or appliances you connect, but rather, how much total power they use.
Current is the amount of electrical charge that flows past a given point in a given time. Current is measured in Amperes, which is Coulombs per Second. Sometimes, erroneously, we use the term current to refer to voltage or power. Voltage is Joules per Coulomb. Power is Joules per Second, or Voltage times Current.