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We need to be able to measure electrical currents, because this will give us the capacity to control it. As soon as we can measure it , we will be able to predict the behaviour and the effects of electrical current on our electric equipment, and on the wires that carry it and so, we will be able to design proper electrical circuits and devices. Also we will be able to calcullae the cost of operating any electrical appliance. Plasma TV, LightBulb, etc.
Electricity is invisible, and we can not control what we don't see . But if we have measurement equipment we will be able to sense it , and then we will control it.
Learning electricity is easy as soon as we learn the meaning of the main units of measurement : Amps, Volts, Ohms, Watts, and Watts per hour.
Also it easy to learn to work with the few and simple equations that explain the laws of the electrical energy :
Like this one :
Voltage = Current * Resistance
Power = Voltage * Current
Resistance = Voltage / Current
Current = Voltage / Resistance
Current = Power / Voltage
Electrical Energy = Power * hours (of operation)
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